Fix documentation on how to provide custom application.properties to …

…bootRun task

readme.md

@@ -106,5 +106,5 @@ To build and launch the ApiDoc Server directly from the sources you may want to
 Unfortunately, you are not able to provide properties to the ApiDoc Server in way stated before. But you are able to provide the path to an application.properties file by setting the gradle project property `application.propeties` in the following way.
 
 ```
-./gradlew bootRun -Papplication.properties=/path/to/my/application.properties
+./gradlew bootRun -PapplicationProperties=/path/to/my/application.properties
 ```