Add descriptions to FakeISISHistoDAE and ExtractMasking re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add description to LoadFullprofResolution and LoadMaskingFile re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add description to SaveDetectorMasks re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add wikis to some algorithms.  Refs #6994.
Add description to LoadISISNexus2 and BinToMDHistoWorkspace re #6994

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/6994_wikimaker' into develop