go/types: update flag documentation for gotype command

The documentation refers to a non longer existing flag (-seq).
Remove those references.

Change-Id: I480b6259f9199b47761dc655a90911eabfe07427
Reviewed-on: https://go-review.googlesource.com/c/go/+/249738
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/go/types/gotype.go b/src/go/types/gotype.go
index 19dd702..eacf68f 100644
--- a/src/go/types/gotype.go
+++ b/src/go/types/gotype.go
@@ -48,9 +48,9 @@
 
 Flags controlling additional output:
 	-ast
-		print AST (forces -seq)
+		print AST
 	-trace
-		print parse trace (forces -seq)
+		print parse trace
 	-comments
 		parse comments (ignored unless -ast or -trace is provided)
 	-panic
@@ -104,8 +104,8 @@
 	compiler   = flag.String("c", "source", "compiler used for installed packages (gc, gccgo, or source)")
 
 	// additional output control
-	printAST      = flag.Bool("ast", false, "print AST (forces -seq)")
-	printTrace    = flag.Bool("trace", false, "print parse trace (forces -seq)")
+	printAST      = flag.Bool("ast", false, "print AST")
+	printTrace    = flag.Bool("trace", false, "print parse trace")
 	parseComments = flag.Bool("comments", false, "parse comments (ignored unless -ast or -trace is provided)")
 	panicOnError  = flag.Bool("panic", false, "panic on first error")
 )