doc/man3: unindent a few unintended code blocks

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1956)

doc/man3/SSL_CTX_add_session.pod

@@ -54,13 +54,13 @@ The following values are returned by all functions:
 
 =item Z<>0
 
- The operation failed. In case of the add operation, it was tried to add
- the same (identical) session twice. In case of the remove operation, the
- session was not found in the cache.
+The operation failed. In case of the add operation, it was tried to add
+the same (identical) session twice. In case of the remove operation, the
+session was not found in the cache.
 
 =item Z<>1
 
- The operation succeeded.
+The operation succeeded.
 
 =back
 

doc/man3/SSL_CTX_flush_sessions.pod

@@ -24,7 +24,7 @@ If enabled, the internal session cache will collect all sessions established
 up to the specified maximum number (see SSL_CTX_sess_set_cache_size()).
 As sessions will not be reused ones they are expired, they should be
 removed from the cache to save resources. This can either be done
- automatically whenever 255 new sessions were established (see
+automatically whenever 255 new sessions were established (see
 L<SSL_CTX_set_session_cache_mode(3)>)
 or manually by calling SSL_CTX_flush_sessions().
 

doc/man3/X509_get_subject_name.pod

@@ -37,7 +37,7 @@ X509_get_subject_name() and X509_set_subject_name() except the get and
 set the issuer name of B<x>.
 
 Similarly X509_REQ_get_subject_name(), X509_REQ_set_subject_name(),
- X509_CRL_get_issuer() and X509_CRL_set_issuer_name() get or set the subject
+X509_CRL_get_issuer() and X509_CRL_set_issuer_name() get or set the subject
 or issuer names of certificate requests of CRLs respectively.
 
 =head1 RETURN VALUES