updating README.md (#3710)

README.md

@@ -52,7 +52,7 @@ developers:
 
 * `p4` (lines 2 and 5): `artifactId`
 * `p4-plugin` (line 3): GitHub repository name
-* `org/jenkins-ci` (line 5): `groupId` (with slashes replacing periods)
+* `org/jenkins-ci/plugins` (line 5): `groupId` (with slashes replacing periods)
 * `p4paul` (line 7): Jenkins community account user name
 
 ### Adding a new plugin
@@ -80,7 +80,7 @@ A plugin can theoretically be replaced by a new one with a different ID, but thi
 If the plugin _hasn't_ been released yet, you can just rename and edit the existing permissions file, changing the `name` component.
 You may also edit the `github` component, if you wish to rename the repository.
 
-### Changing a plugin's `groupId`
+### Changing a plugin's `artifactId`
 
 Changing the `paths` or modifying the `<artifactId>` in the plugin `pom.xml` is highly discouraged.  
 Modifying the path will break any Maven dependencies from other plugins.