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_shutdown.pod

@@ -92,11 +92,6 @@ The following return values can occur:
 
 =over 4
 
-=item 1
-
-The shutdown was successfully completed. The "close notify" alert was sent
-and the peer's "close notify" alert was received.
-
 =item 0
 
 The shutdown is not yet finished. Call SSL_shutdown() for a second time,
@@ -104,6 +99,11 @@ if a bidirectional shutdown shall be performed.
 The output of L<SSL_get_error(3)|SSL_get_error(3)> may be misleading, as an
 erroneous SSL_ERROR_SYSCALL may be flagged even though no error occurred.
 
+=item 1
+
+The shutdown was successfully completed. The "close notify" alert was sent
+and the peer's "close notify" alert was received.
+
 =item -1
 
 The shutdown was not successful because a fatal error occurred either