checkout: add fuzzy branch name suggestions

[rajathkannabiran]

/submit

[gitgitgadget]

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Changes since v1: - Fixed a typo in the commit message (found by ...) - Added a code comment to ... as suggested by ... ... 

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[dscho]

/submit

Hehe, you will want to revisit the documentation... (and probably try /preview first)...

[dscho]

/allow

[gitgitgadget]

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[RatStar811]

@RatStar811