docs/release-notes: add item for sendpayment pay_addr bug fix

docs/release-notes/release-notes-0.13.2.md

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+# Release Notes
+
+# Bug Fixes
+
+[A bug has been fixed in the command line argument parsing for the
+`sendpayment` command that previously prevented users from being able to re-use
+a fully
+specified AMP](https://github.com/lightningnetwork/lnd/pull/5554) invoice by
+generating a new `pay_addr` and including it as a CLI arg.
+
+# Contributors (Alphabetical Order)
+* Olaoluwa Osuntokun