Andrew Gallant 2b1637d1db doc: clarify how -S/--smart-case works ...

Whether or not smart case kicks in can be a little subtle in some cases.
So we document the specific conditions in which it applies. These
conditions were taken directly from the public API docs of the
`grep-regex` crate:
https://docs.rs/grep-regex/0.1.8/grep_regex/struct.RegexMatcherBuilder.html#method.case_smart

Fixes #1708

2020-10-17 18:55:44 -04:00

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