Update DetectionRuleFile.cs (#1421)

Author: jmikell821

src/Elastic.Markdown/Extensions/DetectionRules/DetectionRuleFile.cs

@@ -53,7 +53,7 @@ private string GetMarkdown()
 # Prebuilt detection rules reference
 
 :::{important}
-All prebuilt {{ml}} rules are tagged with `ML`, and their rule type is `machine_learning`. Before using prebuilt {{ml}} rules, ensure you have all of the appropriate requirements.
+All prebuilt machine learning rules are tagged with `ML`, and their rule type is `machine_learning`. Before using prebuilt machine learning rules, ensure you have all of the appropriate requirements.
 :::
 
 """;