Fixed misspelling.

Author: dobooth

docs/commands/codeception.md

@@ -21,7 +21,7 @@ Run all tests without the `<group value="skip"/>` [annotation][]:
 vendor/bin/codecept run functional --skip-group skip  -c dev/tests/acceptance/codeception.yml
 ```
 
-Run all tests with the `<group value="example"/>` [annotation][] but with no `<group value="skpip"/>`:
+Run all tests with the `<group value="example"/>` [annotation][] but with no `<group value="skip"/>`:
 
 ```bash
 vendor/bin/codecept run functional --group example --skip-group skip -c dev/tests/acceptance/codeception.yml