docs: added 502 page instructions for nginx and apache

docs/admin/apache-conf-example.rst

@@ -95,5 +95,9 @@ Below config if for an Apache Reverse Proxy configuration.
         # Diffie-Hellman parameter for DHE ciphersuites, recommended 2048 bits
         #SSLOpenSSLConfCmd DHParameters "/etc/apache2/dhparam.pem"
 
+        ## custom 502 error page. Will be displayed while RhodeCode server
+        ## is turned off
+        ErrorDocument 502 /path/to/.rccontrol/enterprise-1/static/502.html
+
     </VirtualHost>
 

docs/admin/nginx-config-example.rst

@@ -127,7 +127,8 @@ Use the following example to configure Nginx as a your web server.
             proxy_pass      http://rc;
         }
 
-        ## custom 502 error page
+        ## custom 502 error page. Will be displayed while RhodeCode server
+        ## is turned off
         error_page 502 /502.html;
         location = /502.html {
            root  /path/to/.rccontrol/enterprise-1/static;