- update documentation and python_examples/ to reflect the new module name - fix typo arg->args in python_examples/handler.py

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#### Description <!-- Describe your changes in detail --> Update the documentation for module app_python3 to reflect the new name

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/1450

-- Commit Summary --

* app_python3: update documentation

-- File Changes --

M src/modules/app_python3/README (42) M src/modules/app_python3/README.TestCase-Loggers (8) M src/modules/app_python3/doc/Makefile (2) R src/modules/app_python3/doc/app_python3.xml (16) R src/modules/app_python3/doc/app_python3_admin.xml (56) M src/modules/app_python3/python_examples/Loggers.py (87) M src/modules/app_python3/python_examples/TestCase_Traceback.py (16) M src/modules/app_python3/python_examples/handler.py (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1450.patch https://github.com/kamailio/kamailio/pull/1450.diff