chore: rename the key how docs are named

[CommanderStorm]

our style spec currently has two ways of naming the accompanying docs. This fixes this.

The code changed is only ever used to generate docs.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.70%. Comparing base (d933a0c) to head (44713bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1390   +/-   ##
=======================================
  Coverage   93.70%   93.70%           
=======================================
  Files         111      111           
  Lines        4387     4387           
  Branches     1389     1389           
=======================================
  Hits         4111     4111           
  Misses        276      276           

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[github-actions]

Size Change: 0 B

Total Size: 134 kB

ℹ️ View Unchanged

Filename	Size
dist/index.cjs	67.5 kB
dist/index.mjs	66.4 kB

_{compressed-size-action}

[HarelM]

I think maputnik uses that to add an info button for every filled, but I think it uses "doc" only.

[HarelM]

Ahh, this is the expression parameters docs, it's pretty new, so that might be the reason for the misalignment.
I don't think maputnik is using it.