3.5.0: sphinx warnings `reference target not found`

[kloczek]

On building my packages I'm using sphinx-build command with -n switch which shows warmings about missing references. These are not critical issues.
Here is the output with warnings:

Details

+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v6.2.1
making output directory... done
WARNING: The config value `release' has type `list', defaults to `str'.
building [mo]: targets for 0 po files that are out of date
writing output...
building [man]: all manpages
updating environment: [new config] 11 added, 0 changed, 0 removed
reading sources... [100%] uncollectable
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
writing... python-objgraph.3 { objgraph references extra-info highlighting uncollectable generator-sample chain quoting CHANGES HACKING } /home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/docs/index.txt:100: WARNING: py:class reference target not found: MyBigFatObject
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/docs/index.txt:122: WARNING: py:mod reference target not found: linecache
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/docs/index.txt:122: WARNING: py:mod reference target not found: doctest
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/docs/index.txt:122: WARNING: py:func reference target not found: computate_something
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/objgraph.py:docstring of objgraph.show_chain:14: WARNING: py:func reference target not found: gc.get_referrers
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/objgraph.py:docstring of objgraph.show_chain:14: WARNING: py:func reference target not found: gc.get_referents
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: find_chain
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: show_graph
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: obj_node_id
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: obj_label
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: quote
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: long_typename
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: safe_repr
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: short_repr
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: gradient
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: edge_label
/home/tkloczko/rpmbuild/BUILD/objgraph-3.5.0/CHANGES.rst:130: WARNING: py:func reference target not found: _program_in_path
done
build succeeded, 18 warnings.

You can peak on fixes that kind of issues in other projects
RDFLib/rdflib-sqlalchemy#95
RDFLib/rdflib#2036
click-contrib/sphinx-click@abc31069
frostming/unearth#14
jaraco/cssutils#21
latchset/jwcrypto#289
latchset/jwcrypto#289
pypa/distlib@98b9b89f
pywbem/pywbem#2895
sissaschool/elementpath@bf869d9e
sissaschool/xmlschema@42ea98f2
sqlalchemy/sqlalchemy@5e88e6e8