fix missing items/tidy Table of Contents

[nopeitsnothing]

This isn't a content update, it's a meta update (updating the guide's source's pointer links).

• [x] fix missing Table of Contents items
• [x] tidy up
• [x] some things could be shortened to be easier to reference
• [x] remove stale items that weren't referenced in foot of document
• [x] remove in-sentence : where it shouldn't be there
• [x] pick between 10/11 or 10 and 11 (leaning towards 10/11 which sounds better)

[ghost]

What are we doing about this one?