## Summary
The similarity index, the fraction of unchanged lines, is easier to
understand than the jaccard index, the fraction between intersection and
union.
## Test Plan
I ran this on django and git a 0.945 index, meaning 5.5% of lines are
currently reformatted when compared to black
This documentation change improves the section on dangling comments in
the formatter.
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Co-authored-by: David Szotten <davidszotten@gmail.com>
Co-authored-by: Micha Reiser <micha@reiser.io>
I've written done my condensed learnings from working on the formatter
so that others can have an easier start working on it.
This is a pure docs change
