[docs] Wrapped titles have no anchor (e.g. email.message_from_binary_file)

[Rob Wu]

The documentation of email.message_from_binary_file (below
message_from_bytes at
https://docs.python.org/3/library/email.parser.html#email.message_from_bytes
) has no anchor.
This is possibly caused by the fact that in the source, the method
signature is split over two lines:
https://hg.python.org/cpython/file/5b771c662c00/Doc/library/email.parser.rst#l249

If acceptable, an easy fix is to edit the rst file and put the full method
name on one line.
Otherwise the doc generator should be modified to account for multi-line
method signatures.

Kind regards,
 Rob
 https://robwu.nl
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