Schema: Edits to property titles and descriptions plus codelists, closes #480

[kd-ods]

Overview

• What does this pull request do?

Brings the schema descriptions in line with the style guide.

Deals with some specific issues noted re descriptions (#603 #618).

• How can a reviewer test or examine your changes?

Make sure they're familiar with the Style guide. Read through all the edits and suggest changes.

• Who is best placed to review it?

@kathryn-ods

Closes #480 #603 #618

Translations

• New or edited strings appearing as a result of this PR will be picked up for translation
• N/A I've notified the translation coordinator of any new strings that will need
  translating. See: https://openownership.github.io/bods-dev-handbook/translations.html

Documentation & Release

• I've checked that the documentation builds without failing. See: https://github.com/openownership/data-standard#building-the-documentation-locally
• I've thought about how and when this needs to be released. See:
  https://openownership.github.io/bods-dev-handbook/standard_releases.html
• N/A. I've updated the changelog, if necessary.
• N/A. I've updated reference.rst to reflect any changes to schema structure or naming.
• N/A. I've added or edited any other related documentation. See: https://github.com/openownership/bods-dev-handbook/blob/master/style_guide.md

[kathryn-ods]

see line comments

[kd-ods]

Huge thanks for the review, @kathryn-ods . I've either made the suggested edit and resolved the associated comment, or left a comment explaining my thinking. Requesting re-review now & hopefully we can merge this tomorrow.