docs: Made collect_reactions page more explicit.

[Jaskowicz1]

collect_reactions never used "override" with virtual void completed(), this changes that. Whilst it's not needed, it's better to be explicit.

This also clears the random indentation on line 36 (prev. line 29).

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[Jaskowicz1]

PR is marked as draft until #779 is complete so I can deal with the conflicts.

[Jaskowicz1]

It appears "Files Changed" now shows changes from #779.

[braindigitalis]

needs to be merged to dev not master, I have updated this

[Jaskowicz1]

needs to be merged to dev not master, I have updated this

Thought I had, sorry about that!!