Add descriptions to parking values and reorder them

[Nekzuris]

Description, Motivation & Context

Following @tordans suggestion in #1326 (comment), I added descriptions to parking values and reordered them according to taginfo usage while keeping similar values together, like street_side/lane and multi-storey/rooftop.

Related issues

#1325 #1326

Links and data

Relevant OSM Wiki links:

• https://wiki.openstreetmap.org/wiki/Key:parking

Relevant tag usage stats:

https://taginfo.openstreetmap.org/keys/parking#values

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### Wording

- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
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[Nekzuris]

Test-Documentation

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Wording

• American English

[tordans]

Nice, thanks! Now we need to find a way to make those descriptions easier to see in iD, but that is a different story :).