docs: correct webFrame description

[mckravchyk]

Description of Change

The current description incorrectly states that the webFrame export represents the top frame but it actually represents the current frame.

Checklist

• PR description included and stakeholders cc'd
• relevant documentation is changed or added

Release Notes

Notes: none

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[release-clerk]

No Release Notes

[trop]

I have automatically backported this PR to "16-x-y", please check out #32326

[trop]

I have automatically backported this PR to "17-x-y", please check out #32327