[docs] typo fixes in expression queries (#65665)
* Update index.md
Fixing some minor typos.
* make language clearer
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Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
(cherry picked from commit 6e501b9c07)
Co-authored-by: marybelvargas <107340764+marybelvargas@users.noreply.github.com>