Improve formatting in Linux Permissions Guide post by adding spacing in chmod section

Author: js-surya

_posts/2024-12-11-LinuxPermissionsGuide.md

@@ -42,7 +42,9 @@ This representation indicates:
 ### Changing Permissions with `chmod`
 
 #### Symbolic Method
+
 You can add or remove permissions using the symbols `+`, `-`, or `=`:
+
 ```bash
 chmod u+r file.txt      # Add read permission for owner
 chmod g-w file.txt      # Remove write permission for group