Update Knative IP address docs
What does this MR do?
Since we now load the IP address automatically for you per https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23162 we no longer need to mention that it can only be fetched manually. Also since Knative/Serverless features are still in Alpha I did not feel it was necessary to document that this was only available after a certain version.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
- [-] Changelog entry added, if necessary
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Documentation created/updated - [-] Tests added for this feature/bug
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Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides - [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.