Merge 3.4

diff --cc Doc/library/stdtypes.rst
Simple merge

diff --cc Doc/reference/datamodel.rst
Simple merge

diff --cc Misc/NEWS
index 36689c0ed2b97aeb9590188e9d56d3dce6ffbb45,8a6fd245a1184191e84ee3246895713f437da369..fb80c0b284bce3b203fb757a7bc3fc1aea4a4936
--- 1/Misc/NEWS
--- 2/Misc/NEWS
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@@@ -5676,6 -5225,6 +5676,10 @@@ C-AP
  Documentation
  -------------
  
++- Issue #23006: Improve the documentation and indexing of dict.__missing__.
++  Add an entry in the language datamodel special methods section.
++  Revise and index its discussion in the stdtypes mapping/dict section.
++
  - Issue #17701: Improving strftime documentation.
  
  - Issue #18440: Clarify that `hash()` can truncate the value returned from an