Link to section 1.3 in Plan Maintenance

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: aclark4life

.github/INCIDENT_RESPONSE.md

@@ -324,7 +324,7 @@ When a CVE is published for a bundled C library:
 This document is a living record. It should be kept current so it is useful when an
 incident actually occurs.
 
-- **Quarterly review** — revisit during the Section 1.3 readiness review at each quarterly release.
+- **Quarterly review** — revisit during the [Section 1.3 readiness review](#13-readiness-review) at each quarterly release.
 
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