Remove trailing whitespace in CONTRIBUTING.md

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

CONTRIBUTING.md

@@ -37,7 +37,7 @@ SparkOS aims to be:
   - Use tabs for indentation
   - Keep lines under 80 characters when reasonable
   - Comment complex logic
-  
+
 - **Shell Scripts**: Follow Google Shell Style Guide
   - For runtime scripts (inside rootfs): Use `#!/bin/sh` for POSIX-compliant scripts (busybox compatibility)
   - For build scripts (host system): Can use `#!/bin/bash` when bash-specific features are needed