Remove nodiscard from string.gsub

Author: actboy168

meta/template/string.lua

@@ -73,7 +73,6 @@ function string.gmatch(s, pattern, init) end
 ---@param n?      integer
 ---@return string
 ---@return integer count
----@nodiscard
 function string.gsub(s, pattern, repl, n) end
 
 ---#DES 'string.len'