docs: Fix some typos in helpers/html_helper.rst

[obozdag]

Description Fix some typos in helpers/html_helper.rst

Checklist:

• [x] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value
• [ ] Unit testing, with >80% coverage
• [x] User guide updated
• [ ] Conforms to style guide

[github-actions[bot]]

:wave: Hi, @obozdag!

We detected conflicts in your PR against the base branch :speak_no_evil:
You may want to sync :arrows_counterclockwise: your branch with upstream!

Ref: Syncing Your Branch

[kenjis]

Closed by #9153, #9161, #9162, #9163, #9164