Align DrRacket guide key description to keybindings view/dialog

[spdegabrielle]

What version of Racket are you using?
8.14.0.7-2024-10-13-44c1952a65 [cs]. (I don't believe this has changed in 8.15)

What program did you run?
DrRacket / https://docs.racket-lang.org/drracket/Keyboard_Shortcuts.html

What should have happened?

Keybindings view in DrRacket should use the same annotation as the DrRacket manual.

Currently these do not match.

Proposed change - change Guide to match DrRacket
https://github.com/racket/drracket/tree/master/drracket/scribblings/drracket/drracket.scrbl

example: 'forward-character'
(c:f) - DrRacket
C-f : move forward one character - DrRacket manual

https://docs.racket-lang.org/drracket/Keyboard_Shortcuts.html#%28part._.Moving_.Around%29

Please include any other relevant details
e.g., the operating system used or how you are running the code.