Note the comparison fallback in the no-thread-local documentation

The macro page describes what the library defines JSON_NO_THREAD_LOCAL for
by itself in terms of copying alone; comparing falls back the same way.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/macros/json_no_thread_local.md

@@ -28,6 +28,7 @@ By default, `#!cpp JSON_NO_THREAD_LOCAL` is not defined.
 
 The library defines it by itself for Clang targeting MinGW, which does not survive the `#!cpp thread_local` storage:
 copying a value segfaults there, with both old and current Clang versions, while GCC targeting MinGW is unaffected.
+Copying and comparing fall back to working without the call stack there, as they do whenever the macro is defined.
 
 ## Examples