all: use "reports whether" consistently instead of "returns whether"

Follow-up for CL 147037 and after Brad noticed the "returns whether"
pattern during the review of CL 150621.

Go documentation style for boolean funcs is to say:

    // Foo reports whether ...
    func Foo() bool

(rather than "returns whether")

Created with:

    $ perl -i -npe 's/returns whether/reports whether/' $(git grep -l "returns whether" | grep -v vendor)

Change-Id: I15fe9ff99180ad97750cd05a10eceafdb12dc0b4
Reviewed-on: https://go-review.googlesource.com/c/150918
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cmd/trace/annotations.go b/src/cmd/trace/annotations.go
index 2fb1198cf6..2498415681 100644
--- a/src/cmd/trace/annotations.go
+++ b/src/cmd/trace/annotations.go
@@ -538,7 +538,7 @@ func (task *taskDesc) overlappingInstant(ev *trace.Event) bool {
 	return false
 }
 
-// overlappingDuration returns whether the durational event, ev, overlaps with
+// overlappingDuration reports whether the durational event, ev, overlaps with
 // any of the task's region if ev is a goroutine-local event, or overlaps with
 // the task's lifetime if ev is a global event. It returns the overlapping time
 // as well.