* Add ArgumentSpecValidator to docs
* Improve docs for ArgumentSpecValidator
* Document removal of private methods
* Update module_utils documentation
- Add docs for argument spec classes as well as validation and parameters files.
- preserve the order in the source for errors.py
- document DEFAULT_TYPE_VALIDATORS so it can be referenced elsewhere
- fix automodule directive for validation.py
* Update docs in arg_spec and paremeters
- This improves the generated documentation.
* Document breaking changes in porting guide.
* Update formatting in porting guide and add a Deprecated section
* Fine tune module_utils documentation
* Move instance docstring to the __init__ method
Remove optional description since it fails the sanity test and I am not 100% it is valid anyway.
* Remoe incorrect parameter from docstring
This was changed a while ago but wasn't removed from the docstring.
* Use attr rather than attribute
The py:attribute: domain only exists in newer Sphinx >= 3.1.
* Improve documentation on exceptions
* Final pass
- use args/kwargs instead of param
- fix formatting errors that didn't display examples correctly
- format TypeErrors so they are referenced as classes
- specify complex types
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