Add clang-format-diff command line to MR checklist

added patch label

restored source branch update-mr-template2

mentioned in merge request !464 (merged)

It's good to have this in the checklist but let's make it optional so that anyone who doesn't have clang installed or is a new contributor, etc. can still send MRs. We can always run it for them on the branch. I've added that it's optional.

added 1 commit

• 83f7685c - ENH: clang-format is optional in merge checklist

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added 1 commit

• 597fd6e6 - BUG: missing newline in mr template

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merged

mentioned in commit 70da6c02

changed milestone to %7.0.0

added documentation label