:robot: docs: Simplify scripts.
:robot: docs: Simplify scripts.

Replace querySelectorAll(...)[0] by querySelector(...) in docs scripts.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/aureooms/rejuvenate/blob/7545bed46bd3ba60c6bde3730bee151e4c86bac9/src/transforms/codemod:doc-scripts-header-replace-querySelectorAll.js
Please contact the author of the transform if you believe there was an error.

aureooms/js-cardinality