Fix POD errors to stop make install_docs dying with pod2man 2.5.0+

podlators 2.5.0 has switched to dying on POD syntax errors. This means
that a bunch of long-standing erroneous POD in the openssl documentation
now leads to fatal errors from pod2man, halting installation.

Unfortunately POD constraints mean that you have to sort numeric lists
in ascending order if they start with 1: you cannot do 1, 0, 2 even if
you want 1 to appear first. I've reshuffled such (alas, I wish there
were a better way but I don't know of one).
(cherry picked from commit 5cc2707742)

doc/ssl/SSL_CTX_use_psk_identity_hint.pod

@@ -81,6 +81,8 @@ SSL_CTX_use_psk_identity_hint() and SSL_use_psk_identity_hint() return
 
 Return values from the server callback are interpreted as follows:
 
+=over 4
+
 =item > 0
 
 PSK identity was found and the server callback has provided the PSK
@@ -99,4 +101,6 @@ completely.
 PSK identity was not found. An "unknown_psk_identity" alert message
 will be sent and the connection setup fails.
 
+=back
+
 =cut