Fixed header level (#6694) (#6706)

(cherry picked from commit d2aca48)

Co-authored-by: Nastasha Solomon <[email protected]>

Author: mergify[bot]

docs/detections/detection-engine-intro.asciidoc

@@ -120,7 +120,7 @@ To learn how your rules and alerts are affected by using the {ref}/logs-data-str
 
 [discrete]
 [[manage-rule-dac]]
-=== Manage rules as code
+== Manage rules as code
 
 Utilize the https://dac-reference.readthedocs.io/en/latest/dac_concept_and_workflows.html[Detection-as-Code] (DaC) principles to externally manage your detection rules.