bytes: fix up godoc link errors

[Reader.Reader] does not exist in this package.
These docs most likely meant to refer to [Reader] itself.

Change-Id: I4fa117e8541573e0be7c13751fdfc102d5f2d604
Reviewed-on: https://go-review.googlesource.com/c/go/+/582515
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: mvdan

src/bytes/reader.go

@@ -152,8 +152,8 @@ func (r *Reader) WriteTo(w io.Writer) (n int64, err error) {
 	return
 }
 
-// Reset resets the [Reader.Reader] to be reading from b.
+// Reset resets the [Reader] to be reading from b.
 func (r *Reader) Reset(b []byte) { *r = Reader{b, 0, -1} }
 
-// NewReader returns a new [Reader.Reader] reading from b.
+// NewReader returns a new [Reader] reading from b.
 func NewReader(b []byte) *Reader { return &Reader{b, 0, -1} }