fix: jsdoc @example wasn't formatting code snippet. (#62)

[lihbr]

Types of changes

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

Implementing https://github.com/prismicio/prismic-vue/pull/62#issuecomment-1251072905 from #62

Checklist:

• [ ] My change requires an update to the official documentation.
• [x] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [x] All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #67 (40d87a6) into master (7dd808f) will increase coverage by 0.00%. The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master      #67   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          19       19           
  Lines        3229     3237    +8     
  Branches      142      142           
=======================================
+ Hits         3216     3224    +8     
  Misses         13       13           

Impacted Files	Coverage Δ
src/components/SliceZone.ts	99.65% <100.00%> (+<0.01%)	:arrow_up:
src/types.ts	100.00% <100.00%> (ø)
src/usePrismic.ts	100.00% <100.00%> (ø)