Non-existing tags and files reported by Doxygen build

[jhlegarreta]

Description

The ITKDoxygen build is reporting a few non-existing warnings about some tags and files, e.g. in
https://github.com/InsightSoftwareConsortium/ITKDoxygen/actions/runs/3120254526/jobs/5060690356#step:4:1160

warning: Invalid value for 'ALIASES' tag at line 31, file /work/ITK-bld/Utilities/Doxygen/Doxyfile.Documentation: Values in list '"starteraliasnotused=@par not used" "wiki=\par Wiki Examples:<br> ^^ \li <a href="https://www.itk.org/Wiki/ITK/Examples">All Media Wiki Examples</a> ^^" "wikiexample{2}= \li <a href="[https://www.itk.org/Wiki/ITK/Examples/\1](https://www.itk.org/Wiki/ITK/Examples//1)">\2</a> ^^" "endwiki=^^ ^^ ^^" "sphinx=\par ITK Sphinx Examples:<br> ^^ \li <a href="https://itk.org/ITKExamples">All ITK Sphinx Examples</a> ^^" "sphinxexample{2}=\li <a href="[https://itk.org/ITKExamples/src/\1/Documentation.html](https://itk.org/ITKExamples/src//1/Documentation.html)">\2</a> ^^" "endsphinx=^^ ^^ ^^"' are not properly space or comma separated
error: Illegal ALIASES format 'https://www.itk.org/Wiki/ITK/Examples>All Media Wiki Examples</a> ^^'. Use "name=value" or "name{n}=value", where n is the number of arguments
error: Illegal ALIASES format '[https://www.itk.org/Wiki/ITK/Examples/\1](https://www.itk.org/Wiki/ITK/Examples//1)>\2</a> ^^'. Use "name=value" or "name{n}=value", where n is the number of arguments
error: Illegal ALIASES format 'https://itk.org/ITKExamples>All ITK Sphinx Examples</a> ^^'. Use "name=value" or "name{n}=value", where n is the number of arguments
error: Illegal ALIASES format '[https://itk.org/ITKExamples/src/\1/Documentation.html](https://itk.org/ITKExamples/src//1/Documentation.html)>\2</a> ^^'. Use "name=value" or "name{n}=value", where n is the number of arguments

and

warning: tag INPUT: input source '/work/ITK-bld/Documentation/Doxygen' does not exist
warning: tag INPUT: input source '/work/ITK-bld/Documentation/Doxygen/Examples.dox' does not exist

and

Searching for files in directory /work/ITK/Moduleswarning: source '/work/ITK-bld/Documentation/Doxygen' is not a readable file or directory... skipping.
warning: source '/work/ITK-bld/Documentation/Doxygen/Examples.dox' is not a readable file or directory... skipping.

in https://github.com/InsightSoftwareConsortium/ITKDoxygen/actions/runs/3120254526/jobs/5060690356#step:4:2787

Expected information

The Doxygen build should be clean.

Actual information

The groups seem to be present and working as expected in the impacted classes' Doxygen pages, but fixing the warnings is necessary to keep the toolkit healthy and to avoid distractions.

Versions

master

Additional Information

None.