Learn Editor: Update linux-install-manually.md

Author: yujiaoMSFT

defender-endpoint/linux-install-manually.md

@@ -490,7 +490,7 @@ Download the onboarding package from the [Microsoft Defender portal](https://sec
 
    1. Look at the alert details, machine timeline, and perform your typical investigation steps.
 
-## Defender for Endpoint package external package dependencies
+## External package dependencies
 
 For information, see [Prerequisites for Microsoft Defender for Endpoint on Linux: External package dependency](./mde-linux-prerequisites.md#external-package-dependency).