Specify using AllowEncodedSlashes and nocanon for httpd (#7540)

When using wiki page names that include a slash
behind a Apache HTTPD reverse proxy,
AllowEncodedSlashes NoDecode
and appending nocanon to the ProxyPass
directive is required. This commit adds that
information to the documentation.

Signed-off-by: Gary Kim <gary@garykim.dev>

docs/content/doc/usage/reverse-proxies.en-us.md

     ...
     ProxyPreserveHost On
     ProxyRequests off
-    ProxyPass / http://localhost:3000/
+    AllowEncodedSlashes NoDecode
+    ProxyPass / http://localhost:3000/ nocanon
     ProxyPassReverse / http://localhost:3000/
 </VirtualHost>
 ```
     <Proxy *>
          Order allow,deny
          Allow from all
+         AllowEncodedSlashes NoDecode
     </Proxy>
 
-    ProxyPass /git http://localhost:3000 # Note: no trailing slash after either /git or port
+    ProxyPass /git http://localhost:3000 nocanon # Note: no trailing slash after either /git or port
     ProxyPassReverse /git http://localhost:3000 # Note: no trailing slash after either /git or port
 </VirtualHost>
 ```

docs/content/doc/usage/reverse-proxies.zh-cn.md

     ...
     ProxyPreserveHost On
     ProxyRequests off
-    ProxyPass / http://localhost:3000/
+    AllowEncodedSlashes NoDecode
+    ProxyPass / http://localhost:3000/ nocanon
     ProxyPassReverse / http://localhost:3000/
 </VirtualHost>
 ```
     <Proxy *>
          Order allow,deny
          Allow from all
+         AllowEncodedSlashes NoDecode
     </Proxy>
 
-    ProxyPass /git http://localhost:3000 # Note: no trailing slash after either /git or port
+    ProxyPass /git http://localhost:3000 nocanon # Note: no trailing slash after either /git or port
     ProxyPassReverse /git http://localhost:3000 # Note: no trailing slash after either /git or port
 </VirtualHost>
 ```