message: doc: Disambiguate "Keybindings" reference; add example keys
  Add more examples to terminal settings keybindings documentation.
diff: @@ -85,9 +85,9 @@ Properties listed below are specific to each custom key binding.
  | `command` | _Required_ | String | The command executed when the associated key bindings are pressed. |
  | `keys` | _Required_ | Array[String] | Defines the key combinations used to call the command. |
  -### Implemented Keybindings
  +### Implemented Commands
  -Bindings listed below are per the implementation in `src/cascadia/TerminalApp/AppKeyBindingsSerialization.cpp`
  +Commands listed below are per the implementation in [`src/cascadia/TerminalApp/AppKeyBindingsSerialization.cpp`](https://github.com/microsoft/terminal/blob/master/src/cascadia/TerminalApp/AppKeyBindingsSerialization.cpp)
  - copy
  - copyTextWithoutNewlines
  @@ -138,6 +138,15 @@ Bindings listed below are per the implementation in `src/cascadia/TerminalApp/Ap
  - moveFocusDown
  - toggleFullscreen
  +## Example Keys
  +- ctrl+1
  +- ctrl+plus
  +- alt+-
  +- shift+numpad_1
  +- ctrL+shift+numpad_plus
  +- ctrl+pgdn
  +- ctrl+alt+shift+pgup
  +
  ## Background Images and Icons
  Some Terminal settings allow you to specify custom background images and icons. It is recommended that custom images and icons are stored in system-provided folders and are referred to using the correct [URI Schemes](https://docs.microsoft.com/en-us/windows/uwp/app-resources/uri-schemes). URI Schemes provide a way to reference files independent of their physical paths (which may change in the future).
  