gh-114211: Update EmailMessage doc about ordered keys (#114224)

Ordered keys are no longer unlike 'real dict's.
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Terry Jan Reedy 2024-01-17 21:25:22 -05:00 committed by GitHub
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@ -40,9 +40,9 @@ over the object tree.
The :class:`EmailMessage` dictionary-like interface is indexed by the header
names, which must be ASCII values. The values of the dictionary are strings
with some extra methods. Headers are stored and returned in case-preserving
form, but field names are matched case-insensitively. Unlike a real dict,
there is an ordering to the keys, and there can be duplicate keys. Additional
methods are provided for working with headers that have duplicate keys.
form, but field names are matched case-insensitively. The keys are ordered,
but unlike a real dict, there can be duplicates. Addtional methods are
provided for working with headers that have duplicate keys.
The *payload* is either a string or bytes object, in the case of simple message
objects, or a list of :class:`EmailMessage` objects, for MIME container