Feedback: keyboard shortcut changes in v23.1

Raphael ‘kena’ Poss (knz) commented:

The file `_includes/v23.1/sql/shell-shortcuts.md` (note: v23.1, not v22.1) needs to be updated.

New shortcuts:
- Ctrl+O: force a newline on the same statement even after a semicolon.
- Alt+>, Ctrl+End: move cursor to end of multi-line input.
- Alt+<, Ctrl+Home: move cursor to start of multi-line input.
- Alt+O, Insert: toggle overwrite mode.
- Alt+Q: reflow / reformat the current line.
- Alt+Shift+Q, Alt+`: reflow / reformat the entire input.
- Alt+.: hide/show the prompt. (helps with copy-paste of query text)
- Alt+2, Alt+F2: invoke external editor on current input.
- Tab: attempt tab completion (Experimental)

cc @rmloveland
Epic: CRDB-22182

Jira Issue: DOC-7274