revert changlog

Author: sumneko

changelog.md

@@ -6,7 +6,6 @@
 * `FIX` Deduplicate documentation bindings for parameters
 * `FIX` Correct `math.type` meta return annotation to use `nil` instead of the string literal `'nil'`
 * `FIX` Fix initial `nameStyle.config` not getting loaded in the appropriate workspace.
-* `FIX` string.match and string.gmatch may return `string|integer?` [#3357](https://github.com/LuaLS/lua-language-server/issues/3357)
 
 ## 3.18.2
 * `CHG` `duplicate-set-field` diagnostic now supports linked suppression: when any occurrence of a duplicate field is suppressed with `---@diagnostic disable` or `---@diagnostic disable-next-line`, all warnings for that field name will be suppressed