Prog::Fanout() is no longer experimental.

I neglected to remove this comment a couple of years ago when I
overhauled RE2::ProgramFanout()...

Change-Id: I57edad3e60a9c8cbe5b2860a9c347c195d803c48
Reviewed-on: https://code-review.googlesource.com/c/re2/+/59930
Reviewed-by: Perry Lorier <perryl@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed