ps: added examples for current user processes (#1644)

pages/common/ps.md

@@ -13,3 +13,11 @@
 - Search for a process that matches a string:
 
 `ps aux | grep {{string}}`
+
+- List all processes of the current user in extra full format:
+
+`ps --user $(id -u) -F`
+
+- List all processes of the current user as a tree:
+
+`ps --user $(id -u) f`