[clang][analyzer][docs] Fix documentation of checker 'StackAddrAsyncEscape' (NFC) (#108586)

The checker was indicated as a 'C' language checker but is only applicable to 'ObjC' code.

Author: balazske

clang/docs/analyzer/checkers.rst

@@ -2571,8 +2571,8 @@ with the `offsetof` macro.
 
 .. _alpha-core-StackAddressAsyncEscape:
 
-alpha.core.StackAddressAsyncEscape (C)
-""""""""""""""""""""""""""""""""""""""
+alpha.core.StackAddressAsyncEscape (ObjC)
+"""""""""""""""""""""""""""""""""""""""""
 Check that addresses to stack memory do not escape the function that involves dispatch_after or dispatch_async.
 This checker is a part of ``core.StackAddressEscape``, but is temporarily disabled until some false positives are fixed.