fix(math): correct math.type return annotation

changelog.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 <!-- Add all new changes here. They will be moved under a version at release -->
+* `FIX` Correct `math.type` meta return annotation to use `nil` instead of the string literal `'nil'`
 
 ## 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

meta/template/math.lua

@@ -240,7 +240,7 @@ function math.tointeger(x) end
 ---@return
 ---| '"integer"'
 ---| '"float"'
----| 'nil'
+---| nil
 ---@nodiscard
 function math.type(x) end