message: Remove indentation in function args/returns/raises blocks.
  This indentation is not rendered on the resulting pages, and this prevents accidental
  activation of markdown code-formatting when people
  indent these blocks with 4 spaces (mostly: keras, layers).
diff: @@ -28,6 +28,7 @@ from __future__ import division
  from __future__ import print_function
  import itertools
  +import textwrap
  def build_md_page(page_info):
  @@ -300,7 +301,7 @@ def _build_function_details(function_details):
  for detail in function_details:
  sub = []
  sub.append('#### ' + detail.keyword + ':\n\n')
  - sub.append(detail.header)
  + sub.append(textwrap.dedent(detail.header))
  for key, value in detail.items:
  sub.append('* <b>`%s`</b>: %s' % (key, value))
  parts.append(''.join(sub))
  