doc: add note to indicate that the OBJ_ functions were not thread safe in 3.0

Also remove OBJ_thread from the list of non-threadsafe functions.

Reviewed-by: Tomas Mraz <tomas@openss

doc: add note to indicate that the OBJ_ functions were not thread safe in 3.0

Also remove OBJ_thread from the list of non-threadsafe functions.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15713)

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Document openssl thread-safety

Also discuss reference-counting, mutability and safety.

Thanks to David Benjamin for pointing to comment text he added
to boringSSL's header files

Document openssl thread-safety

Also discuss reference-counting, mutability and safety.

Thanks to David Benjamin for pointing to comment text he added
to boringSSL's header files.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13788)

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