top: update page (#3744)

* top: update page

* Update pages/linux/top.md

Co-Authored-By: Zlatan Vasović <zlatanvasovic@gmail.com>

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>

pages/linux/top.md

@@ -14,6 +14,10 @@
 
 `top -u {{user_name}}`
 
+- Show the individual threads of a given process:
+
+`top -Hp {{process_id}}`
+
 - Show only the processes with the given PID(s), passed as a comma-separated list. (Normally you wouldn't know PIDs off hand. This example picks the PIDs from the process name):
 
 `top -p $(pgrep -d ',' {{process_name}})`