doc: use "pull request" instead of "PR" in packages.md

PR-URL: #39213
Reviewed-By: Harshitha K P <harshitha014@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Trott

doc/api/packages.md

@@ -590,9 +590,9 @@ Platform specific conditions such as `"deno"`, `"electron"`, or `"react-native"`
 may be used, but while there remain no implementation or integration intent
 from these platforms, the above are not explicitly endorsed by Node.js.
 
-New conditions definitions may be added to this list by creating a PR to the
-[Node.js documentation for this section][]. The requirements for listing a
-new condition definition here are that:
+New conditions definitions may be added to this list by creating a pull request
+to the [Node.js documentation for this section][]. The requirements for listing
+a new condition definition here are that:
 
 * The definition should be clear and unambiguous for all implementers.
 * The use case for why the condition is needed should be clearly justified.