documentation improvement marking surname, name as main entry in index

[Jan Ulrich Hasecke]

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Hi,

who can I mark an index entry like

Mustermann, Peter

as main entry?

.. index::
single: ! Mustermann, Peter

does not work

neither do:

.. index:: ! Mustermann, Peter

What works is:

.. index::
! single: Mustermann, Peter

Perhaps you can add this to the documentation?

juh

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