Correct the documentation about SSL_CIPHER_description()
There are some ciphersuites that were introduced in TLSv1.0/TLSv1.1 but
are backwards compatible with SSLv3.
Fixes
@@ -124,7 +124,10 @@ Textual representation of the cipher name.
=item <protocol version>
-Protocol version, such as B<TLSv1.2>, when the cipher was first defined.
+The minimum protocol version that the ciphersuite supports, such as B<TLSv1.2>.
+Note that this is not always the same as the protocol version in which the
+ciphersuite was first defined because some ciphersuites are backwards compatible
+with earlier protocol versions.
=item Kx=<key exchange>
