Put private class into an anonmyous namespace.

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[docs] Put DeveloperPolicy under "Development Process Documentation"

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[docs] The GEP FAQ is not "design and overview"

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[docs] Pull IRC and Mailing Lists under a new "Community" heading.

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[docs] Reorganize mailing lists.

Order them roughly by "which one should a newbie join first".

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[docs] Annotate mailing lists with their "name".

Nobody says "the developer's list" or "commits archive"; they always say
"llvmdev" or "llvm-commits". It makes sense for our documentation to
at least make that association explicitly.

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[docs] llvmbugs is not the place for patches.

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