Use fully-qualified names in autodoc directives

[AA-Turner]

This yields identical output, save for api_exceptions (where I contend the change is an improvement).

Previews:

• https://coverage--1882.org.readthedocs.build/en/1882/
• https://coverage--1882.org.readthedocs.build/en/1882/api_coverage.html
• https://coverage--1882.org.readthedocs.build/en/1882/api_coveragedata.html
• https://coverage--1882.org.readthedocs.build/en/1882/api_exceptions.html
• https://coverage--1882.org.readthedocs.build/en/1882/api_module.html
• https://coverage--1882.org.readthedocs.build/en/1882/api_plugin.html

Current:

• https://coverage.readthedocs.io/en/latest/api_coverage.html
• https://coverage.readthedocs.io/en/latest/api_coveragedata.html
• https://coverage.readthedocs.io/en/latest/api_exceptions.html
• https://coverage.readthedocs.io/en/latest/api_module.html
• https://coverage.readthedocs.io/en/latest/api_plugin.html

A

[nedbat]

You are right, the change in exceptions is better! Thanks!