cmd/gofmt: fix const association to avoid inaccurate comment

The const parseTypeParams was grouped with printer-related consts in
gofmt.go, implicitly suggesting that it must be kept in sync with
go/format/format.go.

Change-Id: Ia65dc15c27fef2c389f963071252adee32ec6bd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/300451
Trust: Robert Findley <[email protected]>
Run-TryBot: Robert Findley <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>

Author: findleyr

src/cmd/gofmt/gofmt.go

@@ -51,12 +51,12 @@ const (
 	//
 	// This value is defined in go/printer specifically for go/format and cmd/gofmt.
 	printerNormalizeNumbers = 1 << 30
-
-	// parseTypeParams tells go/parser to parse type parameters. Must be kept in
-	// sync with go/parser/interface.go.
-	parseTypeParams parser.Mode = 1 << 30
 )
 
+// parseTypeParams tells go/parser to parse type parameters. Must be kept in
+// sync with go/parser/interface.go.
+const parseTypeParams parser.Mode = 1 << 30
+
 var (
 	fileSet    = token.NewFileSet() // per process FileSet
 	exitCode   = 0