docs: Update api guides to reflect deprecated searchercontext

[tara-det-ai]

this is a draft PR to address gaps in the docs and test that edits to the docs meet the gaps

if there are any acceptable changes in this PR that are not in eng pr #9904, then we should update #9904

let's not consider this a PR to be merged, rather a conversation about docs changes needed for #9904

docs ticket https://hpe-aiatscale.atlassian.net/jira/software/projects/DOCSMLDX/boards/107?selectedIssue=DOCSMLDX-57

Ticket

Description

Test Plan

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

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