docs: windows - add note about ini comments

docs/sources/installation/windows.md

@@ -27,7 +27,7 @@ this folder to anywhere you want Grafana to run from.  Go into the
 
 The default Grafana port is `3000`, this port requires extra permissions
 on windows. Edit `custom.ini` and uncomment the `http_port`
-configuration option and change it to something like `8080` or similar.
+configuration option (`;` is the comment character in ini files) and change it to something like `8080` or similar.
 That port should not require extra Windows privileges.
 
 Start Grafana by executing `grafana-server.exe`, preferably from the