github: fix build action name

It does more than just build the Python package.

Author: dlech

.github/workflows/pythonpackage.yml renamed to .github/workflows/build.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python package
+name: Build Python package and docs
 
 on: [ push, pull_request ]