docs: fix missing comma in useMutation example to prevent syntax errors (#9593)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: wo-o29

docs/framework/react/typescript.md

@@ -250,8 +250,8 @@ function groupMutationOptions() {
 }
 
 useMutation({
-  ...groupMutationOptions()
-  onSuccess: () => queryClient.invalidateQueries({ queryKey: ['groups'] })
+  ...groupMutationOptions(),
+  onSuccess: () => queryClient.invalidateQueries({ queryKey: ['groups'] }),
 })
 useIsMutating(groupMutationOptions())
 queryClient.isMutating(groupMutationOptions())