docs: Fix typo in the CLI help message

Author: Stranger6667

src/main.rs

@@ -30,7 +30,7 @@ ARGS:
 OPTIONS:
     --inline-style-tags
         Whether to inline CSS from "style" tags. The default value is `true`. To disable inlining
-        from "style" tags use `-inline-style-tags=false`.
+        from "style" tags use `--inline-style-tags=false`.
 
     --remove-style-tags
         Remove "style" tags after inlining.