Rich Text Keyboard Shortcuts

[Ozyugoo]

I noticed that the rich text keyboard shortcuts have not been documented. I believe it needs documentation.

[Ozyugoo]

Wagtail provides Rich Text fields that are preformatted using markdown language. But you can also navigate it using a keyboard short. Some of these keyboard shortcuts are also similar to general keyboard shortcuts. The following are some of Wagtail's rich text keyboard shortcuts:

Use Ctrl + O or Ctrl + M to enter a new line.
Use Ctrl + H or Ctrl + D to delete letters, a highlighted line, or a paragraph.
Ctrl E will open the browser's search bar.
Use Ctrl + F to display the search in the document box.
Use Ctrl + K to add an internal link to another page.
Enter / (Forward slash) to view and use all the preformatted markdowns

[Ozyugoo]

@thibaudcolas, kindly take a look at it.
@lb-, please kindly look at this.

[lb-]

Just cross linking to the page level shortcuts issue. #346