Update getting-started.md (#665)

Update docker image run command

Author: 3usi9

docs/getting-started.md

@@ -26,7 +26,7 @@ after we renamed the "Docker container" section into "Docker image". -->
 Use the `sourcegraph/scip-java` Docker image to run `scip-java`.
 
 ```sh
-$ docker run -v $(pwd):/home/gradle --env JVM_VERSION=17 sourcegraph/scip-java:latest scip-java index
+$ docker run -v $(pwd):/sources --env JVM_VERSION=17 sourcegraph/scip-java:latest scip-java index
 $ src code-intel upload # (optional) upload index to Sourcegraph
 ```
 
@@ -47,13 +47,13 @@ Use the following commands to use a different JVM version:
 
 ```sh
 # Java 8
-docker run -v $(pwd):/home/gradle --env JVM_VERSION=8 sourcegraph/scip-java:latest scip-java index
+docker run -v $(pwd):/sources --env JVM_VERSION=8 sourcegraph/scip-java:latest scip-java index
 
 # Java 11
-docker run -v $(pwd):/home/gradle --env JVM_VERSION=11 sourcegraph/scip-java:latest scip-java index
+docker run -v $(pwd):/sources --env JVM_VERSION=11 sourcegraph/scip-java:latest scip-java index
 
 # Java 17 (default)
-docker run -v $(pwd):/home/gradle --env JVM_VERSION=17 sourcegraph/scip-java:latest scip-java index
+docker run -v $(pwd):/sources --env JVM_VERSION=17 sourcegraph/scip-java:latest scip-java index
 ```
 
 ### Java launcher