[3908] Require OpenSSL >= 1.0.0 in docs

doc/guide/install.xml

@@ -112,9 +112,10 @@
         </para>
         </listitem>
 
-            <listitem>
+          <listitem>
         <para>
-          Botan (at least version 1.8) or OpenSSL.</para>
+          Botan (at least version 1.8) or OpenSSL (at least version 1.0.0).
+        </para>
           </listitem>
 
           <listitem>

doc/guide/intro.xml

@@ -60,8 +60,8 @@
         is required to be installed during compilation. Kea uses the Botan
         crypto library for C++ (<ulink url="http://botan.randombit.net/"/>),
         version 1.8 or later. As an alternative to Botan, Kea can use the
-        OpenSSL crypto library (<ulink url="http://www.openssl.org/"/>).
-        It requires a version with SHA-2 support.
+        OpenSSL crypto library (<ulink url="http://www.openssl.org/"/>),
+        version 1.0.0 or later.
             </simpara>
         </listitem>