Update valid-slash-end-of-string.md

Author: milwad-dev

docs/1.x/valid-slash-end-of-string.md

@@ -1,6 +1,6 @@
 ## ValidSlashEndOfString
 
-If you want to validate a slash that end of the string, you can use `ValidSlashEndOfString` rule:
+If you want to validate a slash at the end of the string, you can use the `ValidSlashEndOfString` rule:
 
 ```php
 use Milwad\LaravelValidate\Rules\ValidSlashEndOfString;