Contrib: spell out and

CONTRIBUTING.md

@@ -143,7 +143,7 @@ Use the following words and phrases as described:
 | malicious actor   | hacker | A person, organization, or even an automated tool which might attempt to acquire secrets, break encryption, deny service, or otherwise attack a secure resource. |
 | a NFToken         | NFT, an NFToken | A NFToken object in the XRP Ledger tracks or represents a non-fungible token. Pronounced "nif-token" and written _a NFToken_ rather than _an NFToken_ |
 | PostgreSQL        | Postgres | A specific brand of relational database software. Always use the full name, not an informal short version. |
-| order book        | orderbook, offer book | A collection of trade orders waiting to be matched & executed, typically sorted by exchange rate. Use two words. |
+| order book        | orderbook, offer book | A collection of trade orders waiting to be matched and executed, typically sorted by exchange rate. Use two words. |
 | server            | node | A server is software and/or hardware, especially the ones that connect to the XRP Ledger peer-to-peer network. The term _node_ is sometimes used for this purpose but is also overloaded with other meanings including entries in a graph and Node.js, a JavaScript interpreter. |
 | stablecoin issuer | gateway | An issuer is the organization that issues a token in the XRP Ledger. A stablecoin is a token where the issuer promises that it is fully backed by some outside asset (such as fiat currency), with the stablecoin issuer providing deposit and withdraw operations to convert between the two (possibly for a fee). Previously the term _gateway_ was used (especially by Ripple, the company) to describe this use case, but the rest of the industry adopted _stablecoin issuer_ instead. |
 | transaction cost  | transaction fee | The amount of XRP burnt to send a transaction in the XRP Ledger. Even though this is specified in the `Fee` field of transactions, the term _fee_ implies that the money is paid to someone, so _cost_ is preferable. |_