Update release notes

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RELEASE_NOTES

@@ -30,8 +30,9 @@ CHANGES
 [/list]
 [/rawarn]
 
-[rasection="New lua/wml features"]
+[rasection="New Lua/WML features"]
 [list]
+[*]Add-on creators can now specify a comma-separated list of tags in the .pbl file, which are used by the Add-ons Manager when filtering add-ons by typing key words into the Filter box. This may be used to make it easier for people to find add-ons, e.g. by including their acronym among the tags. See [wiki]PblWML[/wiki] for details.
 [/list]
 [/rasection]