Docs for statement hint changes

[bsanchez-the-roach]

This was originally meant to just document DOC-16190 but it's now expanded to include all of the v26.2 docs work for Statement Hints, including:

• The introduction of session variable overrides
• Statement hints can now be enabled/disabled
• Statement hints can now be scoped to a specific database
• Both deletions and enabling/disabling can also be scoped to a database, when doing so via statement fingerprint.
• We want to avoid the use of the term "hint injection"

This also resolves DOC-16430, DOC-16428, DOC-16387, DOC-16652, and DOC-16653

[github-actions]

Files changed:

• src/current/_includes/v26.2/misc/force-index-selection.md:
• src/current/v26.2/table-expressions.md
• src/current/v26.2/select-clause.md
• src/current/_includes/v26.2/sql/session-variable-precedence-order.md:
• src/current/v26.2/alter-database.md
• src/current/v26.2/set-vars.md
• src/current/v26.2/session-variables.md
• src/current/v26.2/alter-role.md
• src/current/v26.2/cost-based-optimizer.md
• src/current/v26.2/explain-analyze.md
• src/current/v26.2/explain.md
• src/current/v26.2/show-statement-hints.md
• src/current/v26.2/sql-statements.md

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[github-actions]

Diagram Anchor Check: Failed

Found 3 broken anchor(s) that will cause docs build failures.

Context: EDUENG-613 — same failure mode as 2026-01-29 (opt_with_show_hints_options missing from stmt_block.html).

• explain.html on release-26.2 → missing anchor #explainable_stmt
  • referenced by src/current/v26.2/explain.md
• explain_analyze.html on release-26.2 → missing anchor #explainable_stmt
  • referenced by src/current/v26.2/explain-analyze.md
• show_statement_hints.html on release-26.2 → missing anchor #string_or_placeholder
  • referenced by src/current/v26.2/show-statement-hints.md

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[DrewKimball]

LGTM

[peachdawnleach]

LGTM!