tweak docstrings

This fixes section names:
  Arguments -> Args
  Return -> Returns

It also fixes the last line of the docstring so it isn't cuddled.

And we fix a few docstrings that should be one line but aren't.

BUG=None
TEST=`./buildbot/run_tests` passes

Change-Id: Iaafb7d346a3aee97a40dab340463894c02533091
Reviewed-on: https://chromium-review.googlesource.com/176279
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_deps_diff.py b/scripts/cros_deps_diff.py
index b0aee96..8633f94 100644
--- a/scripts/cros_deps_diff.py
+++ b/scripts/cros_deps_diff.py
@@ -42,7 +42,8 @@
   """Gets the closure of the reverse dependencies of a node.
 
   Walks the tree along all the reverse dependency paths to find all the nodes
-  of the divergent set that transitively depend on the input node."""
+  of the divergent set that transitively depend on the input node.
+  """
   s = set()
   def GetClosure(name):
     node = deps_map[name]
@@ -83,7 +84,8 @@
   """Gets the set of divergent packages.
 
   Divergent packages are those that have a different version among the input
-  dependency graphs (or missing version altogether)."""
+  dependency graphs (or missing version altogether).
+  """
   divergent_set = set()
   for pkg, value in version_map.iteritems():
     if len(value.keys()) != count or len(set(value.values())) > 1: