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>

src/database/sql/sql.go

@@ -2821,7 +2821,7 @@ func (ci *ColumnType) ScanType() reflect.Type {
 	return ci.scanType
 }
 
-// Nullable returns whether the column may be null.
+// Nullable reports whether the column may be null.
 // If a driver does not support this property ok will be false.
 func (ci *ColumnType) Nullable() (nullable, ok bool) {
 	return ci.nullable, ci.hasNullable