message: docs: reflect the pypi move from superset to apache-superset
diff: @@ -176,7 +176,7 @@ Superset installation and initialization
  Follow these few simple steps to install Superset.::
  # Install superset
  - pip install superset
  + pip install apache-superset
  # Initialize the database
  superset db upgrade
  @@ -748,7 +748,7 @@ Upgrading
  Upgrading should be as straightforward as running::
  - pip install superset --upgrade
  + pip install apache-superset --upgrade
  superset db upgrade
  superset init
  