Correct capitalization of PyPI (#1084)

As spelled on https://pypi.org/.

Author: jdufresne

README.rst

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+.. image:: https://badge.fury.io/py/tox.svg
+  :target: https://badge.fury.io/py/tox
+  :alt: Latest version on PyPI
+.. image:: https://img.shields.io/pypi/pyversions/tox.svg
+  :target: https://pypi.org/project/tox/
+  :alt: Supported Python versions
+.. image:: https://dev.azure.com/toxdev/tox/_apis/build/status/tox%20ci?branchName=master
+  :target: https://dev.azure.com/toxdev/tox/_build/latest?definitionId=9&branchName=master
+  :alt: Azure Pipelines build status
+.. image:: https://api.codeclimate.com/v1/badges/425c19ab2169a35e1c16/test_coverage
+   :target: https://codeclimate.com/github/tox-dev/tox/code?sort=test_coverage
+   :alt: Test Coverage
+.. image:: https://readthedocs.org/projects/tox/badge/?version=latest&style=flat-square
+  :target: https://tox.readthedocs.io/en/latest/?badge=latest
+  :alt: Documentation status
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+  :target: https://github.com/ambv/black
+  :alt: Code style: black
+
+tox automation project
+======================
+
+**vision: standardize testing in Python**
+
+tox aims to automate and standardize testing in Python. It is part of a larger vision of easing the packaging, testing and release process of Python software.
+
+What is tox?
+============
+
+tox is a generic virtualenv management and test command line tool you can use for:
+
+* checking your package installs correctly with different Python versions and
+  interpreters
+
+* running your tests in each of the environments, configuring your test tool of choice
+
+* acting as a frontend to Continuous Integration servers, greatly
+  reducing boilerplate and merging CI and shell-based testing.
+
+For more information and the repository please see:
+
+- home and docs: https://tox.readthedocs.org
+
+- repository: https://github.com/tox-dev/tox

docs/changelog/1084.doc.rst

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+Correct the capitalization of PyPI throughout the documentation - by :user:`jdufresne`.