Update restore docs to reflect changes in restore process

What does this MR do and why?

Describe in detail what your merge request does and why.

Update restore docs to reflect changes in restore process for PG VIEWS.

MR !118830 (merged) introduced changes in the restore process for SQL data that skip views owned by PostgreSQL extensions.

• To be merged after !118830 (merged)

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Related to gitlab-org/charts/gitlab#2469 (closed)