update developer guide

Signed-off-by: Hailong Cui <[email protected]>

DEVELOPER_GUIDE.md

@@ -12,13 +12,13 @@ Notifications plugin for OpenSearch enables other plugins to send notifications
 
 ## Documentation
 
-Please see our [documentation](https://opendistro.github.io/for-elasticsearch-docs/).
+Please see our [documentation](https://opensearch.org/docs/latest/observing-your-data/notifications/index/)
 
 ## Setup
 
 1. Check out this package from version control.
-1. Launch Intellij IDEA, choose **Import Project**, and select the `settings.gradle` file in the root of this package.
-1. To build from the command line, set `JAVA_HOME` to point to a JDK >= 14 before running `./gradlew`.
+1. Launch Intellij IDEA, choose **Import Project**, and select the `settings.gradle` file under notifications folder of this package.
+1. To build from the command line, set `JAVA_HOME` to point to a JDK >= 11 before running `./gradlew`.
 
 ### Setup email notification using localhost email relay/server
 
@@ -85,8 +85,8 @@ OR
 ```
 
 The OpenSearch server JVM will launch suspended and wait for a debugger to attach to `localhost:5005` before starting the OpenSearch server.
-The IDE needs to listen for the remote JVM. If using Intellij you must set your debug-configuration to "Listen to remote JVM" and make sure "Auto Restart" is checked.
-You must start your debugger to listen for remote JVM before running the commands.
+The IDE needs to listen for the remote JVM. If using Intellij you must set your debug-configuration to "Listen to remote JVM" and make sure **"Auto Restart"** is checked.
+You must start your debugger to listen for remote JVM **before** running the commands.
 
 To debug code running in an integ test (which exercises the server from a separate JVM), run:
 
@@ -130,4 +130,4 @@ See [NOTICE](NOTICE.txt) for more information.
 
 ## Copyright
 
-Copyright OpenSearch Contributors. See [NOTICE](NOTICE.txt) for details.
+Copyright OpenSearch Contributors. See [NOTICE](NOTICE.txt) for details.