add an obvious args list to shut up buildifier (#586)

* Fix docstring to shut up buildifier

pkg/private/pkg_files.bzl

diff --git a/pkg/private/pkg_files.bzl b/pkg/private/pkg_files.bzl
index 1415cb7..5922b35 100644
--- a/pkg/private/pkg_files.bzl
+++ b/pkg/private/pkg_files.bzl
@@ -289,7 +289,6 @@
             )
 
 
-
 def add_from_default_info(
         content_map,
         file_deps,
@@ -349,7 +348,7 @@
     DefaultInfo was created with an executable in it.
     See: https://github.com/bazelbuild/bazel/issues/14811
 
-    Inputs:
+    Args:
       src: A label.
     Returns:
       File or None.