Fix up the Add Space googleform page

[annawb]

• Make it uniform (awb and csk)
• Add descriptions to unclear things

https://docs.google.com/forms/d/1SOVXWJwnDq9_8yTc5zZy1-kOzFsUqf2HqABn2LCbPn8/edit

[annawb]

Add a space:

• The wording is inconsistent: in “add space” you speak about categories; in maps its “type”; and the names of the categories/types differ from the ones given in the map overview.
• In “add space” you have 9 categories; in the map are only 5.

[annawb]

Fixed.