Issue #14824: Update Repr.repr_TYPE documentation to use correct name mangling implementation.

Patch by Chris Rebert.

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branch : 3.4
Issue #16827: Make Interpreter introduction section of the tutorial more
focussed and move advanced section and customization information to a separate
file called appendix.

Patch credits: Jamayla Wiley, Ya-Ting Huang and James Brewer.

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branch : 3.4
Issue #22436: Improved documentation for getEffectiveLevel() and getLevelName().

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branch : 3.4