docs: update htmx.find and htmx.findAll

[lzcampos]

Description

Just updated htmx.find and htmx.findAll docs, so it does not cause any confusion. The search is not inclusive, as this methods are basically querySelector wrappers

Corresponding issue: https://github.com/bigskysoftware/htmx/issues/3392

Checklist

• [*] I have read the contribution guidelines
• [*] I have targeted this PR against the correct branch (master for website changes, dev for source changes)
• [*] This is either a bugfix, a documentation update, or a new feature that has been explicitly approved via an issue