style-guide: add a note about avoiding general terminal functionality (#18438)

Author: Managor

contributing-guides/style-guide.md

@@ -317,6 +317,8 @@ When describing keycaps or a keyboard shortcut for a utility, use the same [keyp
 
 If a program requires root privileges to run and doesn't provide its own prompt for a password, prepend the command with `sudo` (e.g. `sudo apt update`).
 
+Avoid explaining general UNIX concepts that could apply to any command (i.e. relative/absolute paths, glob patterns/wildcards, special character escaping, program return values, ...)
+
 ### Standardized Terms
 
 Some terms are used repeatedly throughout pages, and as such, should be standardized. These include: