Clarify parameters for interpolate expression

[ward]

The parameters to the interpolate expression were unclear to me. Instead, this PR adds names for the parameters in the syntax example. It also specifies all allowed types of stop_output_i, based on the text preceding it.

Launch Checklist

• [ ] Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask! I saw the parameter names after being told to compare current docs with mapbox docs for interpolate. Does that count as backport?
• [x] Briefly describe the changes in this PR.
• [ ] Add an entry to CHANGELOG.md under the ## main section. --> I don't know if this change is significant enough for that.
• [ ] The syntax method is turning into a pretty long line in the docs this way. Is there a way to tell it to spread across multiple lines or does that involve editing the code that actually generates the docs?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.70%. Comparing base (947b273) to head (e300747). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #833   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files         105      105           
  Lines        4646     4646           
  Branches     1312     1312           
=======================================
  Hits         4307     4307           
  Misses        339      339           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[HarelM]

Thanks for taking the time to open this PR! Most syntax definitions do not have a parameter name and type, most only have type. I find this syntax definition not so helpful in most cases, do you think more examples or improving the text of this item can be a better solution? Also it would be great if you could attach a before and after screenshots of the docs in regards to this change.

THANKS!!

[HarelM]

Any updates on this?

[HarelM]

@ward can you address the comment I made?

[HarelM]

Closing at there was not response. If there is still an issue, feel free to open a new PR or reopen this one.