[doc] devtools: mention clang-format dependency

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Sjors Provoost 2019-02-19 17:08:01 +01:00
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@ -7,6 +7,8 @@ clang-format-diff.py
A script to format unified git diffs according to [.clang-format](../../src/.clang-format).
Requires `clang-format`, installed e.g. via `brew install clang-format` on macOS.
For instance, to format the last commit with 0 lines of context,
the script should be called from the git root folder as follows.