tree fbdf48df8c06aa97468b499a54dc762141332e6c
parent 1bda1c2700dfe1876e2f106fc218403f63794df2
author Ian McKellar <ianloic@google.com> 1500936283 -0700
committer Ian McKellar <ianloic@google.com> 1500936283 -0700

Update css to visually differentiate h4, h5, h6 in markdown.

They're currently styled the same which makes:
  https://fuchsia.googlesource.com/tracing/+/master/docs/trace_format.md
confusing to read.

My proposed styling changes are subtle but there's not a lot of room to
work with.

Change-Id: I7d4583d6d61e621b24ae3cf0a8f4ec9a4f5d69d6