Copy into wiki section re #7365

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Update after talk with Anders re #7365

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Tidy wiki description format re #7365

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/7365_wiki_4_load_instrument_from_nexus' into develop