go/token,scanner: fix comments so godoc aligns properly

R=iant, r2
CC=golang-dev
https://golang.org/cl/3532042

src/pkg/go/scanner/scanner.go

@@ -7,9 +7,9 @@
 // Typical use:
 //
 //	var s Scanner
-//      fset := token.NewFileSet()  // position information is relative to fset
+//	fset := token.NewFileSet()  // position information is relative to fset
 //	s.Init(fset, filename, src, nil /* no error handler */, 0)
-//      for {
+//	for {
 //		pos, tok, lit := s.Scan()
 //		if tok == token.EOF {
 //			break

src/pkg/go/token/position.go

@@ -32,9 +32,9 @@ func (pos *Position) IsValid() bool { return pos.Line > 0 }
 // String returns a string in one of several forms:
 //
 //	file:line:column    valid position with file name
-//      line:column         valid position without file name
-//      file                invalid position with file name
-//      -                   invalid position without file name
+//	line:column         valid position without file name
+//	file                invalid position with file name
+//	-                   invalid position without file name
 //
 func (pos Position) String() string {
 	s := pos.Filename