Update cheatsheets

tldr/linux/stress

@@ -10,16 +10,16 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Spawn 4 workers to stress test CPU:
 
-`stress -c {{4}}`
+`stress {{[-c|--cpu]}} {{4}}`
 
 - Spawn 2 workers to stress test IO and timeout after 5 seconds:
 
-`stress -i {{2}} -t {{5}}`
+`stress {{[-i|--io]}} {{2}} {{[-t|--timeout]}} {{5}}`
 
 - Spawn 2 workers to stress test memory (each worker allocates 256M bytes):
 
-`stress -m {{2}} --vm-bytes {{256M}}`
+`stress {{[-m|--vm]}} {{2}} --vm-bytes {{256M}}`
 
 - Spawn 2 workers spinning on write()/unlink() (each worker writes 1G bytes):
 
-`stress -d {{2}} --hdd-bytes {{1GB}}`
+`stress {{[-d|--hdd]}} {{2}} --hdd-bytes {{1GB}}`