cmd/pprof/internal/profile: insert blank line after non-doc comment

Change-Id: I91fe72c60d6c41644780474620e05380e9af2a3d
Reviewed-on: https://go-review.googlesource.com/7620Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Rob Pike <r@golang.org>

src/cmd/pprof/internal/profile/filter.go

@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Implements methods to filter samples from profiles.
+
 package profile
 
 import "regexp"