[docs] [issue21439] Numerous minor issues in Language Reference

[Roundup Robot]

Roundup Robot added the comment:

New changeset be8492101251 by Zachary Ware in branch '3.4':
Issue #21439: Fix a couple of typos.
http://hg.python.org/cpython/rev/be8492101251

New changeset 99b469758f49 by Zachary Ware in branch 'default':
Issue #21439: Merge with 3.4
http://hg.python.org/cpython/rev/99b469758f49

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