Highlight Ctrl-r keybinding on docs page

[mrnugget]

I had to look 5 times and I think highlighting it like this might've reduced it to 2 :)

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

[github-actions]

Fossier: Manual Review Requested

@mrnugget is a new contributor. A maintainer should review this PR before merging.

Score Breakdown

Total Score: 66.7/100 | Confidence: 100% | Outcome: REVIEW

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[greptile-apps]

Greptile Summary

This PR improves the basic usage docs by visually highlighting the ctrl-r keybinding. The main changes are:

• Wrapped the opening-TUI ctrl-r mention in inline code formatting.
• Wrapped the filter-mode cycling ctrl-r mention in inline code formatting.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed documentation.

Important Files Changed

Filename	Overview
docs/docs/guide/basic-usage.md	Formats two ctrl-r keybinding mentions as inline code without changing the documented behavior.

_{Reviews (1): Last reviewed commit: "Highlight `Ctrl-r` keybinding on docs pa..." | Re-trigger Greptile}

[ellie]

Good idea, thank you!

Is there anywhere else you looked before finding it? Maybe we could put it in a few places 🤔

[mrnugget]

Yeah, I looked here and expected it to have a list of all keybindings: https://docs.atuin.sh/cli/configuration/key-binding/

And then I looked here and also couldn't find a list of default keybindings: https://docs.atuin.sh/cli/configuration/advanced-key-binding/

Ideally there'd be a list with the 5 most common keybindings that I need to know.