Fix some filename/URL issues.

- Change transaction-results/transaction-results/ to not repeat itself,
  adding a redirect from the old URL.
- Fix Japanese localization of 'tasks' not being updated to 'how-tos'.
  (Translated pages in this subfolder were not being shown as translated
  due to the mismatch.)
- Fix unparsed `[base58][]` link in addresses snippet.

docs/concepts/transactions/finality-of-results/index.md

@@ -27,7 +27,7 @@ Any other transaction result is potentially not final. In that case, the transac
 
 ## How can non-final results change?
 
-When you initially submit a transaction, the `rippled` server tentatively applies that transaction to its current open ledger, then returns the tentative [transaction results](../../../references/protocol/transactions/transaction-results/transaction-results.md) from doing so. However, the transaction's final result may be very different than its tentative results, for several reasons:
+When you initially submit a transaction, the `rippled` server tentatively applies that transaction to its current open ledger, then returns the tentative [transaction results](../../../references/protocol/transactions/transaction-results/index.md) from doing so. However, the transaction's final result may be very different than its tentative results, for several reasons:
 
 - The transaction may be delayed until a later ledger version, or may never be included in a validated ledger. For the most part, the XRP Ledger follows a principle that all valid transactions should be processed as soon as possible. However, there are exceptions, including:
 
@@ -55,6 +55,6 @@ When you initially submit a transaction, the `rippled` server tentatively applie
 ## See Also
 
 - [Look up Transaction Results](look-up-transaction-results.md)
-- [Transaction Results Reference](../../../references/protocol/transactions/transaction-results/transaction-results.md)
+- [Transaction Results Reference](../../../references/protocol/transactions/transaction-results/index.md)
 
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docs/concepts/transactions/finality-of-results/look-up-transaction-results.md

@@ -63,7 +63,7 @@ The following example shows a successful transaction, as returned by the [tx met
 }
 ```
 
-This example shows an [AccountSet transaction][] sent by the [account](../../accounts/index.md) with address `rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn`, using [Sequence number][] 376. The transaction's [identifying hash][] is `017DED8F5E20F0335C6F56E3D5EE7EF5F7E83FB81D2904072E665EEA69402567` and its [result](../../../references/protocol/transactions/transaction-results/transaction-results.md) is `tesSUCCESS`. The transaction was included in ledger version 46447423, which has been validated, so these results are final.
+This example shows an [AccountSet transaction][] sent by the [account](../../accounts/index.md) with address `rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn`, using [Sequence number][] 376. The transaction's [identifying hash][] is `017DED8F5E20F0335C6F56E3D5EE7EF5F7E83FB81D2904072E665EEA69402567` and its [result](../../../references/protocol/transactions/transaction-results/index.md) is `tesSUCCESS`. The transaction was included in ledger version 46447423, which has been validated, so these results are final.
 
 
 ### Case: Not Included in a Validated Ledger
@@ -75,7 +75,7 @@ If the transaction's failure is not final, it may still become included in a _fu
 
 ### Case: Included in a Validated Ledger
 
-If the transaction _is_ included in a validated ledger, then the [transaction metadata](../../../references/protocol/transactions/metadata.md) contains a full report of all changes that were made to the ledger state as a result of processing the transaction. The metadata's `TransactionResult` field contains a [transaction result code](../../../references/protocol/transactions/transaction-results/transaction-results.md) that summarizes the outcome:
+If the transaction _is_ included in a validated ledger, then the [transaction metadata](../../../references/protocol/transactions/metadata.md) contains a full report of all changes that were made to the ledger state as a result of processing the transaction. The metadata's `TransactionResult` field contains a [transaction result code](../../../references/protocol/transactions/transaction-results/index.md) that summarizes the outcome:
 
 - The code `tesSUCCESS` indicates that the transaction was, more or less, successful.
 - A `tec`-class code indicates that the transaction failed, and its only effects on the ledger state are to destroy the XRP [transaction cost](../transaction-cost.md) and possibly perform some bookkeeping like removing [expired Offers](../../tokens/decentralized-exchange/offers.md#offer-expiration) and [closed payment channels](../../payment-types/payment-channels.md#payment-channel-lifecycle).
@@ -450,6 +450,6 @@ Most other transactions create a specific type of ledger entry and [adjust the s
 - **References:**
     - [Ledger Entry Types Reference](../../../references/protocol/ledger-data/ledger-entry-types/index.md) - All possible fields of all types of ledger entries
     - [Transaction Metadata](../../../references/protocol/transactions/metadata.md) - Summary of the metadata format and fields that appear in metadata
-    - [Transaction Results](../../../references/protocol/transactions/transaction-results/transaction-results.md) - Tables of all possible result codes for transactions.
+    - [Transaction Results](../../../references/protocol/transactions/transaction-results/index.md) - Tables of all possible result codes for transactions.
 
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docs/concepts/transactions/finality-of-results/transaction-malleability.md

@@ -143,7 +143,7 @@ The process to exploit a vulnerable system follows a series of steps like the fo
 - **References:**
     - [Basic Data Types - Hashes](../../../references/protocol/data-types/basic-data-types.md#hashes)
     - [Transaction Common Fields - Global Flags](../../../references/protocol/transactions/common-fields.md#global-flags)
-    - [Transaction Results](../../../references/protocol/transactions/transaction-results/transaction-results.md)
+    - [Transaction Results](../../../references/protocol/transactions/transaction-results/index.md)
     - [Serialization Format](../../../references/protocol/binary-format.md)
 
 {% raw-partial file="/docs/_snippets/common-links.md" /%}