docs: update release notes for 0.13.3

docs/release-notes/release-notes-0.13.3.md

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+# Release Notes
+
+## Wallet
+
+* [The `DefaultDustLimit` method has been removed in favor of `DustLimitForSize` which calculates the proper network dust limit for a given output size. This also fixes certain APIs like SendCoins to be able to send 294 sats to a P2WPKH script.](https://github.com/lightningnetwork/lnd/pull/5781)
+
+# Contributors (Alphabetical Order)
+
+* Eugene Siegel