Simplify installation command for Defender on Linux

Removed redundant '--install' flag from installation command.

Author: avtanshgupta

defender-endpoint/linux-install-with-defender-deployment-tool.md

@@ -225,7 +225,7 @@ To preview new features and provide early feedback, it's recommended that you co
 1. Install Microsoft Defender for Endpoint on Linux using the production channel.
 
    ```bash
-   sudo ./defender_deployment_tool.sh --install --channel prod
+   sudo ./defender_deployment_tool.sh --channel prod
    ```
 
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