Adds commandline note for ledger_entry.md

content/references/rippled-api/public-rippled-methods/ledger-methods/ledger_entry.md

@@ -7,6 +7,8 @@ The `ledger_entry` method returns a single ledger object from the XRP Ledger in
 
 An example of the request format:
 
+**Note:** There is no commandline syntax for `ledger_data`. You can use the [json method][] to access this method from the commandline instead.
+
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