message: [docs] minor file name and format fix for the setup document
diff: @@ -106,7 +106,7 @@ Finally, to make changes to the rst files and build the docs using Sphinx,
  you'll need to install a handful of dependencies from the repo you cloned:
  cd incubator-superset
  - pip install -r docs/requirements-docs.txt
  + pip install -r docs/requirements.txt
  To get the feel for how to edit and build the docs, let's edit a file, build
  the docs and see our changes in action. First, you'll want to
  @@ -417,8 +417,7 @@ https://github.com/apache/incubator-superset/pull/3013
  Every once in a while we want to compile the documentation and publish it.
  Here's how to do it.
  - .. code::
  -
  +```
  # install doc dependencies
  pip install -r docs/requirements.txt
  @@ -441,6 +440,7 @@ https://github.com/apache/incubator-superset/pull/3013
  git add .
  git commit -a -m "New doc version"
  git push origin master
  +```
  ## Publishing a Pypi release
  @@ -453,8 +453,7 @@ https://github.com/apache/incubator-superset/pull/3013
  Following a set of cherries being picked, a release can be pushed to
  Pypi as follows:
  - .. code::
  -
  +```
  # branching off of master
  git checkout -b 0.25
  @@ -489,6 +488,7 @@ https://github.com/apache/incubator-superset/pull/3013
  # this will overwrite the CHANGELOG.md with only the version range
  # so you'll want to copy paste that on top of the previous CHANGELOG.md
  # open a PR against `master`
  +```
  In the future we'll start publishing release candidates for minor releases
  only, but typically not for micro release.
  