add park environment and ops environment comments

Author: mattsb42-aws

tox.ini

@@ -12,6 +12,14 @@ envlist =
 # linters :: Runs all linters over all source code.
 # linters-tests :: Runs all linters over all tests.
 
+# Operational helper environments:
+# docs :: Builds Sphinx documentation.
+# serve-docs :: Starts local webserver to serve built documentation.
+# park :: Builds name-parking packages using pypi-parker.
+# build :: Builds source and wheel dist files.
+# test-release :: Builds dist files and uploads to testpypi pypirc profile.
+# release :: Builds dist files and uploads to pypi pypirc profile.
+
 [testenv:base-command]
 commands = pytest --basetemp={envtmpdir} -l --cov dynamodb_encryption_sdk {posargs}
 
@@ -231,6 +239,15 @@ deps =
 commands =
     python -m http.server {posargs}
 
+# Release tooling
+[testenv:park]
+basepython = python3.6
+skip_install = true
+deps =
+    pypi-parker
+    setuptools
+commands = python setup.py park
+
 # Release tooling
 [testenv:build]
 basepython = python3