regexp/syntax: regenerate docs with mksyntaxgo
This makes the docs up-to-date by running doc/mksyntaxgo from the google/re2 repo.
Change-Id: I80358eed071e7566c85edaeb1cc5514a6d8c37a7
GitHub-Last-Rev:
0f8c8df4f213ce89fbea89e81f0ea3babd59d38f
GitHub-Pull-Request: golang/go#65249
Reviewed-on: https://go-review.googlesource.com/c/go/+/558136
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>