Remove broken link from DEVELOPER_GUIDE.md (opensearch-project#2582)

* Update DEVELOPER_GUIDE.md

Signed-off-by: Saadat Nursultan <nursultan.saadat@gmail.com>

* Update DEVELOPER_GUIDE.md

Signed-off-by: Saadat Nursultan <nursultan.saadat@gmail.com>

* Update DEVELOPER_GUIDE.md

Signed-off-by: Saadat Nursultan <nursultan.saadat@gmail.com>

* Update DEVELOPER_GUIDE.md

Signed-off-by: Saadat Nursultan <nursultan.saadat@gmail.com>

---------

Signed-off-by: Saadat Nursultan <nursultan.saadat@gmail.com>
Signed-off-by: Maciej Mierzwa <dev.maciej.mierzwa@gmail.com>

DEVELOPER_GUIDE.md

@@ -45,8 +45,16 @@ cd $OPENSEARCH_HOME
 
 The `curl localhost:9200` call should succeed again. Kill the server with `Ctrl+c`. We are now ready to install the security plugin.
 
+
 >Worth noting:\
-> The version of OpenSearch and the security plugin must match as there is an explicit version check at startup. This can be a bit confusing as, for example, at the time of writing this guide, the `main` branch of this security plugin builds version `1.3.0.0-SNAPSHOT` compatible with OpenSearch `1.3.0-SNAPSHOT` that gets built from branch `1.x`. Check the expected compatible version [here](https://github.com/opensearch-project/security/blob/main/plugin-descriptor.properties#L27) and make sure you get the correct branch from OpenSearch when building that project.
+> The version of OpenSearch and the security plugin must match as there is an explicit version check at startup. This can be a bit confusing as, for example, at the time of writing this guide, the `main` branch of this security plugin builds version `3.0.0.0-SNAPSHOT` compatible with OpenSearch `3.0.0`. Check the expected compatible version in `build.gradle` file [here](https://github.com/opensearch-project/security/blob/main/build.gradle) and make sure you get the correct branch from OpenSearch when building that project.
+> 
+> The line to look for: `opensearch_version = System.getProperty("opensearch.version", "x")`
+> 
+> Alternatively, you can find the compatible version of OpenSearch by running in project root folder
+> ```
+> ./gradlew properties -q | grep -E '^version:' | awk '{print $2}'
+> ```
 
 ## Building