cmd/guru: fix typo of 'hyphen' to rename to 'comma'

start|end byte offset separator is not hyphen(-), actually comma(,)

Change-Id: I344ae74d33863e9456e8cdb2f058fd70f1eedf95
Reviewed-on: https://go-review.googlesource.com/35770
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1 file changed