[V4] fix wysiwyg hint

[vincentbpro]

What does it do?

Adds a missing hint on the WYSIWYG component, it reuses the same hint component used for the inputJSON field.

Why is it needed?

Fields are expected to show their description below in the hint component

[codecov]

Codecov Report

Merging #11620 (fa482ee) into releases/v4 (710e2a7) will increase coverage by 47.12%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           releases/v4   #11620       +/-   ##
================================================
+ Coverage             0   47.12%   +47.12%     
================================================
  Files                0      212      +212     
  Lines                0     8117     +8117     
  Branches             0     1775     +1775     
================================================
+ Hits                 0     3825     +3825     
- Misses               0     3525     +3525     
- Partials             0      767      +767     

Flag	Coverage Δ
unit	47.12% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ackages/core/admin/server/services/content-type.js	95.77% <100.00%> (ø)
packages/plugins/i18n/server/services/metrics.js	100.00% <0.00%> (ø)
...ckages/plugins/i18n/server/services/iso-locales.js	100.00% <0.00%> (ø)
packages/core/database/lib/fields.js	10.20% <0.00%> (ø)
test/helpers/create-context.js	100.00% <0.00%> (ø)
packages/core/utils/lib/set-creator-fields.js	100.00% <0.00%> (ø)
packages/core/strapi/lib/services/metrics/index.js	59.18% <0.00%> (ø)
...ages/core/strapi/lib/commands/generate-template.js	94.87% <0.00%> (ø)
...ages/plugins/i18n/server/services/content-types.js	88.88% <0.00%> (ø)
.../plugins/i18n/server/content-types/locale/index.js	100.00% <0.00%> (ø)
... and 203 more

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[soupette]

LGTM