Update src/reference/config/writing-platform-configs.rst

Author: wxtim

src/reference/config/writing-platform-configs.rst

@@ -28,6 +28,8 @@ To see a list of available platforms::
 To see the full configuration of available platforms::
 
    cylc config --platform-meta
+   
+This is equivalent to `cylc config -i 'platforms' -i 'platform groups'`
 
 What Are Platforms?
 -------------------