Man, there were a lot of renamings :)
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NKurt Roeckx <kurt@openssl.org>

Reviewed-by: NAndy Polyakov <appro@openssl.org>

Make all mention of digest algorithm use "any supported algorithm"

RT2071, some new manpages from Victor B. Wagner <vitus@cryptocom.ru>:
    X509_LOOKUP_hash_dir.pod
    X509_check_ca.pod
    X509_check_issued.pod

RT 1600:
    Remove references to non-existant objects(3)
    Add RETURN VALUES to BIO_do_accept page.

RT1818:
    RSA_sign Can return values other than 0 on failure.

RT3634:
    Fix AES CBC aliases (Steffen Nurpmeso <sdaoden@yandex.com>)

RT3678:
    Some clarifications to BIO_new_pair
    (Devchandra L Meetei <dlmeetei@gmail.com>)

RT3787:
    Fix some EVP_ function return values
    (Laetitia Baudoin <lbaudoin@google.com>)
Reviewed-by: NTim Hudson <tjh@openssl.org>

L<foo|foo> is sub-optimal  If the xref is the same as the title,
which is what we do, then you only need L<foo>.  This fixes all
1457 occurrences in 349 files.  Approximately.  (And pod used to
need both.)
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Andy found an additional typo "can be can be".
Now I have that silly "Que sera sera" song stuck in my head.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

The doc says that port can be "*" to mean any port.
That's wrong.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

PR#3071

The primary changes made are:
- Updates to the "NAME" section of many pages to correctly reflect the
functions defined on those pages. This section is automatically parsed
by the util/extract-names.pl script, so if it is not correct then
running "man" will not correctly locate the right manual pages.
- Updates to take account of where functions are now deprecated
- Full documentation of the ec sub-library
- A number of other typo corrections and other minor tweaks

since it's both enumerated and explained in BIO_s_connect.pod.
PR: 370

Update docs.