go,gopls: remove license from package doc comments

Inspired by http://go.dev/cl/465995, add a blank line between
license and package statement to avoid the license appearing
in the package doc comment.

Change-Id: I867e0729ca1fdc1bcee34964954549e5c92f2b31
Reviewed-on: https://go-review.googlesource.com/c/tools/+/466215
TryBot-Result: Gopher Robot <[email protected]>
gopls-CI: kokoro <[email protected]>
Reviewed-by: Robert Findley <[email protected]>
Run-TryBot: Suzy Mueller <[email protected]>

Author: suzmue

go/analysis/passes/ifaceassert/parameterized.go

@@ -1,6 +1,7 @@
 // Copyright 2022 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+
 package ifaceassert
 
 import (

go/ssa/subst.go

@@ -1,6 +1,7 @@
 // Copyright 2022 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+
 package ssa
 
 import (

gopls/internal/lsp/cache/os_windows.go

@@ -1,6 +1,7 @@
 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+
 package cache
 
 import (