json schema: use description

[tjhei]

VSCode uses "description" to show documentation and not "documentation". This seems to be the correct convention, see
https://json-schema.org/learn/miscellaneous-examples for example.

part of #552

[tjhei]

note, we need to merge #556 and #557 and then update the schema output before merging this.

@MFraters where is the "documentation" tag used? I did not get any errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a01bf98) 93.54% compared to head (fd6a979) 93.54%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #560   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          92       92           
  Lines        6340     6340           
=======================================
  Hits         5931     5931           
  Misses        409      409           

Files	Coverage Δ
source/world_builder/types/array.cc	100.00% <100.00%> (ø)
source/world_builder/types/bool.cc	100.00% <100.00%> (ø)
source/world_builder/types/double.cc	100.00% <100.00%> (ø)
source/world_builder/types/object.cc	100.00% <100.00%> (ø)
source/world_builder/types/one_of.cc	100.00% <100.00%> (ø)
source/world_builder/types/plugin_system.cc	100.00% <100.00%> (ø)
source/world_builder/types/point.cc	100.00% <100.00%> (ø)
source/world_builder/types/segment.cc	100.00% <100.00%> (ø)
source/world_builder/types/string.cc	100.00% <100.00%> (ø)
source/world_builder/types/unsigned_int.cc	100.00% <100.00%> (ø)
... and 1 more

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.022 ± 0.006 (s=440)	1.024 ± 0.005 (s=442)	+0.0% .. +0.3%
Slab interpolation curved simple none	1.027 ± 0.002 (s=446)	1.027 ± 0.002 (s=433)	+0.0% .. +0.1%
Spherical slab interpolation simple none	1.262 ± 0.004 (s=358)	1.264 ± 0.044 (s=357)	-0.5% .. +0.7%
Slab interpolation simple curved CMS	1.097 ± 0.003 (s=453)	1.099 ± 0.004 (s=369)	+0.1% .. +0.3%
Spherical slab interpolation simple CMS	1.861 ± 0.005 (s=220)	1.859 ± 0.004 (s=266)	-0.2% .. -0.1%
Spherical fault interpolation simple none	1.272 ± 0.008 (s=355)	1.273 ± 0.006 (s=355)	-0.1% .. +0.2%
Cartesian min max surface	2.354 ± 0.023 (s=196)	2.359 ± 0.018 (s=188)	-0.1% .. +0.5%
Spherical min max surface	7.343 ± 0.017 (s=68)	7.351 ± 0.014 (s=57)	-0.0% .. +0.2%

[MFraters]

I think it is just used in the declarations file and the schema file. But let's not update it in this pull request, but update it in a follow up pull request to #562.