Fix OpenAPI summary for the recording endpoint

[mickel8]

I also feel like the operationId and summary for:

• /hls/{room_id}/{filename}:
• /recording/{recording_id}/{filename}:

could be improved?

Acknowledging the stipulations set forth:

• [x] I hereby confirm that a Pull Request involving updates to the Software Development Kit (SDK) has been smoothly merged, currently awaits processing, or is otherwise deemed unnecessary in this context.
• [x] I also affirm that another Pull Request, specifically addressing updates to the documentation body (commonly referred to as 'docs'), has either been successfully incorporated, is in the process of review, or is considered superfluous under the prevailing circumstances.

[codecov[bot]]

Codecov Report

Merging #111 (a54e5d2) into main (bf1809a) will increase coverage by 1.56%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   84.72%   86.28%   +1.56%     
==========================================
  Files          50       50              
  Lines         897      897              
==========================================
+ Hits          760      774      +14     
+ Misses        137      123      -14     

Files	Coverage Δ
.../jellyfish_web/controllers/recording_controller.ex	86.66% <ø> (ø)

... and 1 file with indirect coverage changes

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