[Fleet]: Outdated screenshot for Integration upgrade page.

[amolnater-qasource]

Description:
Outdated screenshot for Integration upgrade page.

Link:
https://www.elastic.co/guide/en/fleet/current/upgrade-integration.html#upgrade-integration-to-latest-version
https://www.elastic.co/guide/en/fleet/current/upgrade-integration.html#upgrade-integration-policies-manually

Actual Screenshot:

Expected Screenshot:

[amolnater-qasource]

@muskangulati-qasource Please review.

[muskangulati-qasource]

Secondary review is Done for this ticket!!

[amolnater-qasource]

FYI @kilfoyle