Fix grammar mistake in the developer documentation

Author: Diogo Correia

docs/dev.md

@@ -233,7 +233,7 @@ The skaffold configuration is generated by the `create_skaffold_configuration(..
 This function also generates the skaffold entries for the Dockerfiles of the micro-services used in the application.
 The skaffold generation is based on the [`skaffold-template.yaml`](../deployment-configuration/skaffold-template.yaml) from the CloudHarness project located in [`deployment-configuration`](../deployment-configuration/).
 This base configuration is merged with the configuration dedicated to a specific project and which is located in the `deployment-configuration` folder of the project.
-Finally, once all the requiered information are injected in the skaffold configuration dictionnary, the dictionnary is saved as a YAML file in the `deployment/skaffold.yaml` file in the project directory.
+Finally, once all the requiered information is injected in the skaffold configuration dictionnary, the dictionnary is saved as a YAML file in the `deployment/skaffold.yaml` file in the project directory.
 
 #### How to extend the deployment generation