PY-16765 Automatically add indentation after section header in Google code style docstrings

python/testData/editing/sectionIndentInsideGoogleDocString.after.py

@@ -0,0 +1,5 @@
+def f(param):
+    """
+    Args:
+      param
+    """

python/testData/editing/sectionIndentInsideGoogleDocString.py

@@ -0,0 +1,4 @@
+def f(param):
+    """
+    Args:<caret>
+    """