Add non breaking space shortcut displays a non breaking space as keyboard shortcut

[afercia]

Description

DIscovered while working on #60567

Introduced in #43150

In the post editor keyboard shortcuts modal dialog, the instructions for the 'Add non breaking space' keyboard shortcuts are literally instructing users to 'Press Shift Command and non breaking space to get a non breaking space'. Clearly a typo from 810e49d

Step-by-step reproduction instructions

• Open the Post editor keyboard shortcut modal dialog
• Observe the 'Add non breaking space' keyboard shortcut displays the modifier keys and a grey square with a space. Screenshot:

• Open the Site editor keyboard shortcut modal dialog
• Observe the 'Add non breaking space' keyboard shortcut displays the modifier keys and a grey square with teh text 'SPACE". Screenshot:

To double check, search for all occurrences of the code to display the keyboard shortcut in all the editors an observe onlyt he post editor one is wrong. Screenshot:

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes