message: Change Fedora installation instructions + some small formatting changes
diff: @@ -121,7 +121,7 @@ For **Fedora** and **RHEL-derivatives**, the following command will ensure
  that the required dependencies are installed: ::
  sudo yum upgrade python-setuptools
  - sudo yum install gcc gcc-c++ libffi-devel python-devel python-pip python-wheel openssl-devel libsasl2-devel openldap-devel
  + sudo yum install gcc gcc-c++ libffi-devel python-devel python-pip python-wheel openssl-devel cyrus-sasl-devel openldap-devel
  **Mac OS X** If possible, you should upgrade to the latest version of OS X as issues are more likely to be resolved for that version.
  You *will likely need* the latest version of XCode available for your installed version of OS X. You should also install
  @@ -157,7 +157,7 @@ You can create and activate a virtualenv by: ::
  python3 -m venv venv
  . venv/bin/activate
  -On windows the syntax for activating it is a bit different: ::
  +On Windows the syntax for activating it is a bit different: ::
  venv\Scripts\activate
  @@ -764,7 +764,7 @@ The following keys in `superset_config.py` can be specified to configure CORS:
  * ``CORS_OPTIONS``: options passed to Flask-CORS (`documentation <https://flask-cors.corydolphin.com/en/latest/api.html#extension>`)
  -DOMAIN SHARDING
  +Domain Sharding
  ---------------
  Chrome allows up to 6 open connections per domain at a time. When there are more
  @@ -776,7 +776,7 @@ doesn't allow cross-domain request).
  * ``SUPERSET_WEBSERVER_DOMAINS``: list of allowed hostnames for domain sharding feature. default `None`
  -MIDDLEWARE
  +Middleware
  ----------
  Superset allows you to add your own middleware. To add your own middleware, update the ``ADDITIONAL_MIDDLEWARE`` key in
  