godoc/vfs/zipfs: fix godoc formatting

Change-Id: I0303e362e82b713823b46247d15baa2ff6f6a344
Reviewed-on: https://go-review.googlesource.com/c/tools/+/199617
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/godoc/vfs/zipfs/zipfs.go b/godoc/vfs/zipfs/zipfs.go
index d3ef88a..a82febe 100644
--- a/godoc/vfs/zipfs/zipfs.go
+++ b/godoc/vfs/zipfs/zipfs.go
@@ -7,14 +7,14 @@
 //
 // Assumptions:
 //
-// - The file paths stored in the zip file must use a slash ('/') as path
-//   separator; and they must be relative (i.e., they must not start with
-//   a '/' - this is usually the case if the file was created w/o special
-//   options).
-// - The zip file system treats the file paths found in the zip internally
-//   like absolute paths w/o a leading '/'; i.e., the paths are considered
-//   relative to the root of the file system.
-// - All path arguments to file system methods must be absolute paths.
+//  - The file paths stored in the zip file must use a slash ('/') as path
+//    separator; and they must be relative (i.e., they must not start with
+//    a '/' - this is usually the case if the file was created w/o special
+//    options).
+//  - The zip file system treats the file paths found in the zip internally
+//    like absolute paths w/o a leading '/'; i.e., the paths are considered
+//    relative to the root of the file system.
+//  - All path arguments to file system methods must be absolute paths.
 package zipfs // import "golang.org/x/tools/godoc/vfs/zipfs"
 
 import (