Fix broken link to ps2avrgb flashing instructions (#7011)

quantum/template/ps2avrgb/readme.md

@@ -12,7 +12,7 @@ Make example for this keyboard (after setting up your build environment):
 
     make %KEYBOARD%:default
 
-Flashing example for this keyboard ([after setting up the bootloadHID flashing environment](flashing_bootloadhid.md))
+Flashing example for this keyboard ([after setting up the bootloadHID flashing environment](https://docs.qmk.fm/#/flashing_bootloadhid))
 
     make %KEYBOARD%:default:flash