Clarify zoekt indexing happens automatically when it is enabled
What does this MR do?
This change updates the documentation for setting up Zoekt (a code search tool) to clarify how indexing works. Previously, the docs made it seem like manual setup was required for indexing. The update explains that after enabling exact code search, Zoekt will automatically index projects when they're updated or created, and makes it clear that manually indexing specific groups is optional rather than required. This should reduce confusion for users who might have thought they needed to manually set up indexing for the feature to work.
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