Update the documentation about hidden files on macOS

Author: mdmintz

help_docs/hidden_files_info.md

@@ -1,6 +1,14 @@
-## Info about hidden files on macOS
+## Showing hidden files on macOS
 
-Depending on your macOS settings, some files may be hidden from view in your Finder window, such as ``.gitignore``. To view all files, run the following command and then reopen the Finder window:
+Depending on your macOS settings, some files may be hidden from view in your Finder window, such as ``.gitignore``.
+
+* On newer versions of macOS, use the following in a Finder window to view hidden files:
+
+Press the **“Command” + “Shift” + “.” (period)** keys at the same time.
+
+(The hidden files will show up as translucent in the folder. If you want to obscure the files again, press the same “Command” + “Shift” + “.” (period) combination.)
+
+* On older versions of macOS, use the following command in a Terminal window to view hidden files, and then reopen the Finder window:
 
 ```bash
 defaults write com.apple.finder AppleShowAllFiles -bool true