In #97921 (comment) @hugovk noticed that Sphinx has deprecated some of the .. index:: entry types:

module, keyword, operator, object, exception, statement, builtin
These all create two index entries. For example, module: hashlib creates the entries module; hashlib and hashlib; module. (These are Python-specific and therefore deprecated.)

Currently we are using some of those in the docs, so we have at least 3 options:

• keep using them if it's a silent deprecation with no removal plans
• reimplement them in pyspecific.py, if we want to keep use them (and if it's possible to reimplement them)
• remove them and replace them with the non-deprecated ones

(cc @AA-Turner)