fix Incorrect LuaCats parsing for "'"

fix #2757

Author: sumneko

changelog.md

@@ -4,6 +4,7 @@
 <!-- Add all new changes here. They will be moved under a version at release -->
 * `NEW` Add matching checks between the shape of tables and classes, during type checking. [#2768](https://github.com/LuaLS/lua-language-server/pull/2768)
 * `FIX` Error `attempt to index a nil value` when `Lua.hint.semicolon == 'All'` [#2788](https://github.com/LuaLS/lua-language-server/issues/2788)
+* `FIX` Incorrect LuaCats parsing for `"'"`
 
 ## 3.10.3
 `2024-8-8`

script/parser/luadoc.lua

@@ -674,7 +674,7 @@ local function parseString(parent)
     -- compatibility
     if content:sub(1, 1) == '"'
     or content:sub(1, 1) == "'" then
-        if content:sub(1, 1) == content:sub(-1, -1) then
+        if #content > 1 and content:sub(1, 1) == content:sub(-1, -1) then
             mark = content:sub(1, 1)
             content = content:sub(2, -2)
         end