resolve #163 - add missing perldoc for ENV var methods

Changes

@@ -47,6 +47,9 @@
     - Remove dependency on constant - internal DEBUG, XHTML_DTD and EBCDIC
       constants changes to $_DEBUG, $_XHTML_DTD, and $_EBCDIC
 
+    [ DOCUMENTATION ]
+    - Add missing documentation for env variable fetching routines (GH #163)
+
 4.13 2014-12-18
 
     [ RELEASE NOTES ]

lib/CGI.pod

@@ -3254,55 +3254,70 @@ path as well.
 Returns either the remote host name or IP address.
 if the former is unavailable.
 
+=item B<remote_ident()>
+
+Returns the name of the remote user (as returned by identd) or undef
+if not set
+
 =item B<remote_addr()>
 
 Returns the remote host IP address, or 
 127.0.0.1 if the address is unavailable.
 
+=item B<request_uri()>
+
+Returns the interpreted pathname of the requested document or CGI
+(relative to the document root). Or undef if not set.
+
 =item B<script_name()>
-Return the script name as a partial URL, for self-referring
-scripts.
+
+Return the script name as a partial URL, for self-referring scripts.
 
 =item B<referer()>
 
 Return the URL of the page the browser was viewing
 prior to fetching your script.  Not available for all
 browsers.
 
-=item B<auth_type ()>
+=item B<auth_type()>
 
 Return the authorization/verification method in use for this
 script, if any.
 
-=item B<server_name ()>
+=item B<server_name()>
 
 Returns the name of the server, usually the machine's host
 name.
 
-=item B<virtual_host ()>
+=item B<virtual_host()>
 
 When using virtual hosts, returns the name of the host that
 the browser attempted to contact
 
-=item B<server_port ()>
+=item B<server_port()>
 
 Return the port that the server is listening on.
 
-=item B<virtual_port ()>
+=item B<server_protocol()>
+
+Returns the protocol and revision of the incoming request, or defaults
+to HTTP/1.0 if this is not set
+
+=item B<virtual_port()>
 
 Like server_port() except that it takes virtual hosts into account.
 Use this when running with virtual hosts.
 
-=item B<server_software ()>
+=item B<server_software()>
 
 Returns the server software and version number.
 
-=item B<remote_user ()>
+=item B<remote_user()>
 
 Return the authorization/verification name used for user
 verification, if this script is protected.
 
-=item B<user_name ()>
+=item B<user_name()>
 
 Attempt to obtain the remote user's name, using a variety of different
 techniques.  This only works with older browsers such as Mosaic.