Rewrite the documentation for sk_TYPE_find() and sk_TYPE_find_ex() to better
describe the vagaries in their behaviour.

[skip ci]

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2958)
1 file changed