Fix the comments on ParseInteger().
Fix the comments on ParseInteger().

Change-Id: I7892c1b08d4a296f4712e1d4d26c456a45b181ee
Reviewed-on: https://code-review.googlesource.com/16190
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2