Updated pydoc topics for 3.4.1rc1 release.

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Bump version number for 3.4.2rc1 release.

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Added tag v3.4.2rc1 for changeset 8711a0951384

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Post-release engineering work for 3.4.2rc1.

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Merge.

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Closes #21431: make docs depend on Sphinx 1.2 and fix pydoc-topics builder to
return Unicode strings on Python 3.

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extra : rebase_source : ef8af147105fee94129e2b4f1de65ac42d3cec23
Fix formatting typo in Misc/NEWS.

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Fix pydoc topics.  I'll regenerate this again for 3.4.2 final,
but fixing it now means the test suite can have zero errors
during the next two weeks.

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