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_generate_deps_graphs.py b/scripts/cros_generate_deps_graphs.py
index b7dffb2..4ff80ce 100644
--- a/scripts/cros_generate_deps_graphs.py
+++ b/scripts/cros_generate_deps_graphs.py
@@ -22,7 +22,8 @@
   """Gets the closure of the reverse dependencies of a node.
 
   Walks the tree along all the reverse dependency paths to find all the nodes
-  that transitively depend on the input node."""
+  that transitively depend on the input node.
+  """
   s = set()
   def GetClosure(name):
     s.add(name)
@@ -56,7 +57,8 @@
 def GenerateDotGraph(package, deps_map, options):
   """Generates the dot source for the dependency graph leading to a node.
 
-  The output is a list of lines."""
+  The output is a list of lines.
+  """
   deps = GetReverseDependencyClosure(package, deps_map)
   node = deps_map[package]