Improve documentation for PEP 370 support in site module (#8617).
site.USER_BASE and site.USER_SITE are now fully documented. PEP 370 is outdated with respects to the Mac framework situation, but the code in sysconfig and the example in the 3.2 What’s New document helped me find the right values to document for Mac OS X.
The command-line interface of the site module, partly documented in the 3.2 What’s New, is fully described in the module docs.
The purpose of the usercustomize module is explained in the site docs, with a gentle introduction in the tutorial (right after the section that talks about PYTHONSTARTUP; a comment mentions it should be moved from the tutorial to another file, but that will be another bug).
Various markup and wording improvements were made along the way in the site module docs. Duplicate and incomplete declarations of environment variables have also been removed (the original bug report was actually about these entries :). The site module docs are still a bit messy; I’ll see about improving them for #11553.
All these sections are copiously interlinked and findable from the doc indexes.