Various updates to WW user manual

[sallybracegirdle]

Please check the following:

• [ ] Has the code POD documentation been added or updated?
• [ ] Whether this PR should include changes to any public documentation, or the FAQ;
• [ ] All cobrand-specific commits start their commit message with the cobrand in square brackets;
• [ ] Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• [ ] Will cobrand-specific changes require additional work to ensure consistent behaviour on www.fixmystreet.com?
• [ ] Are the changes tested for accessibility?
• [ ] Have you updated the changelog? If this is not necessary, put square brackets around this: skip changelog

Please check the contributing docs, and describe your pull request here. Screenshots or GIF animations (using e.g. LICEcap) may be helpful.

Please include any issues that are fixed, using "fixes" or "closes" so that they are auto-closed when the PR is merged.

Thanks for contributing!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.93%. Comparing base (1615200) to head (45557b3).

:exclamation: There is a different number of reports uploaded between BASE (1615200) and HEAD (45557b3). Click for more details.

HEAD has 13 uploads less than BASE

| Flag | BASE (1615200) | HEAD (45557b3) | |------|------|------| ||15|2|

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5023 +/- ## =========================================== - Coverage 82.60% 68.93% -13.68% =========================================== Files 396 42 -354 Lines 30810 5090 -25720 Branches 4884 0 -4884 =========================================== - Hits 25452 3509 -21943 + Misses 3911 1581 -2330 + Partials 1447 0 -1447 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.