fix(en/flameshot): delay should be milliseconds (#8276)

pages/linux/flameshot.md

@@ -32,6 +32,6 @@
 
 `flameshot gui --clipboard`
 
-- Create a screenshot with a specific delay in seconds:
+- Create a screenshot with a specific delay in milliseconds:
 
-`flameshot full --delay {{5}}`
+`flameshot full --delay {{5000}}`