Write google docs notes into formal documentation

[paigeh-fsa]

Link google doc here and write this work into formal documentation and add into correct place of markdown file.

[jwestw]

@paigeh1 I have created a new branch. https://github.com/ONSdigital/SDG_11.2.1/tree/421-google-notes-to-formal

[paigeh-fsa]

• [x] State caveat of LA boundaries in Scotland #285

[paigeh-fsa]

@jwestw need some info on bus portal data (didn't see it in the google docs)

[paigeh-fsa]

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