[3.10] gh-99502: mention bytes-like objects as input in `secrets.compare_digest` (GH-99512) (#99790)

gh-99502: mention bytes-like objects as input in `secrets.compare_digest` (GH-99512)

Now it is in sync with https://docs.python.org/3/library/hmac.htmlGH-hmac.compare_digest
It is the same function, just re-exported. So, I guess they should mention the same input types.
(cherry picked from commit 47d673d81fc315069c14f9438ebe61fb70ef1ccc)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>