Unify changelog sections, shorten documentation

CHANGELOG.rst

@@ -91,8 +91,8 @@ Features
   ``platform.machine()``. (`#740 <https://github.com/tox-dev/tox/issues/740>`_)
 
 
-Documentation improvements
-^^^^^^^^^^^^^^^^^^^^^^^^^^
+Documentation
+^^^^^^^^^^^^^
 
 - Change favicon to the vector beach ball - by @hazalozturk
   (`#748 <https://github.com/tox-dev/tox/issues/748>`_)
@@ -118,8 +118,8 @@ Miscellaneous
 2.9.1 (2017-09-29)
 ------------------
 
-Misc
-^^^^
+Miscellaneous
+^^^^^^^^^^^^^
 
 - integrated new release process and fixed changelog rendering for pypi.org -
   by `@obestwalter <https://github.com/obestwalter>`_.
@@ -145,8 +145,8 @@ Bugfixes
   (`#571 <https://github.com/tox-dev/tox/issues/571>`_)
 
 
-Misc
-^^^^
+Miscellaneous
+^^^^^^^^^^^^^
 
 - `#635 <https://github.com/tox-dev/tox/issues/635>`_ inherit from correct exception -
   by `@obestwalter <https://github.com/obestwalter>`_
@@ -158,8 +158,8 @@ Misc
   by `@obestwalter <https://github.com/obestwalter>`_.
 
 
-Improved Documentation
-^^^^^^^^^^^^^^^^^^^^^^
+Documentation
+^^^^^^^^^^^^^
 
 - add `towncrier <https://github.com/hawkowl/towncrier>`_ to allow adding
   changelog entries with the pull requests without generating merge conflicts;

pyproject.toml

@@ -39,7 +39,7 @@ requires = [
 
     [[tool.towncrier.type]]
         directory = "doc"
-        name = "Documentation improvements"
+        name = "Documentation"
         showcontent = true
 
     [[tool.towncrier.type]]

tox.ini

@@ -22,12 +22,11 @@ commands = pytest {posargs:--cov="{envsitepackagesdir}/tox" --cov-config="{toxin
 
 [testenv:docs]
 description = invoke sphinx-build to build the HTML docs and check that all links are valid
-passenv = *
 basepython = python3.6
 extras = docs
 changedir = {toxinidir}
 commands = sphinx-build -d "{toxworkdir}/docs_doctree" doc "{toxworkdir}/docs_out" --color -W -bhtml {posargs}
-           python -m webbrowser -t "{toxworkdir}/docs_out/index.html"
+           python -c 'print("documentation available under file://{toxworkdir}/docs_out/index.html")'
 
 [testenv:fix-lint]
 description = format the code base to adhere to our styles, and complain about what we cannot do automatically