Users find it difficult to differentiate between Tor Browser's various bridge options

During usability testing of Connection Settings conducted in #52 (closed) & #78 (closed) participants who elected to select a bridge manually tended to try the various options at random.

For the most part, the options are placed in the order it's most useful to try them in:

1. Select a built-in bridge
   1. obfs4
   2. snowflake
   3. meek-azure
2. Request a bridge from torproject.org
3. Provide a bridge manually

However we don't communicate that explicitly to the user.

The redesign conducted in tpo/applications/tor-browser#41080 (closed) also attempted to improve the UX by tidying away the inputs into separate dialogues, and by has provided extra space for descriptions to accompany each bridge option within the dialogues themselves. I think it would be worthwhile reviewing the descriptions added for built-in-bridges, looking for potential improvements, and to consider adding similar descriptions to the request a bridge and provide a bridge dialogues.