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Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

Upper case causes it not to work

re #22143

To avoid clashing with the default seealso directive
re #22143

re #21243

re #11966

re #11821

refs #11307. Should fix the broken doctest

The converted text is stored in separate .rst files in the docs directory.
Refs #9562