chore add syntax highlighting

src/content/docs/apm/agents/java-agent/additional-installation/install-new-relic-java-agent-gae-flexible-environment.mdx

@@ -61,7 +61,7 @@ This example describes how to add New Relic to your GAE flex app by installing t
     1. Add the Java agent dependencies to the project's `target` directory when the project is built, when you [download and unzip all Java agent components](/docs/agents/java-agent/frameworks/maven-installation-java#h2-zip).
     2. After adding the Java agent dependencies to the `pom.xml`, build your application by running:
 
-       ```
+       ```sh
        mvn clean install
        ```
     3. Check your project's `target` directory to find the app's `WAR` file and an unzipped `newrelic` directory.
@@ -77,9 +77,9 @@ This example describes how to add New Relic to your GAE flex app by installing t
     id="configure-app-yaml"
     title="3. Configure your app.yaml"
   >
-    The [app.yaml](https://cloud.google.com/appengine/docs/flexible/java/configuring-your-app-with-app-yaml) configuration file is required for a GAE flexible environment app with a custom runtime. At a minimum, make sure it contains:
+    The [`app.yaml`](https://cloud.google.com/appengine/docs/flexible/java/configuring-your-app-with-app-yaml) configuration file is required for a GAE flexible environment app with a custom runtime. At a minimum, make sure it contains:
 
-    ```
+    ```yml
     env: flex
     runtime: custom
     ```
@@ -91,7 +91,7 @@ This example describes how to add New Relic to your GAE flex app by installing t
   >
     The [Dockerfile](http://docs.docker.com/engine/reference/builder/) defines the Docker image to be built and is required for a GAE flexible environment app. In the following Dockerfile example code, the `newrelic.yml` and `catalina.sh` files have been configured locally, to replace those already copied to the Docker image. (You can add your [New Relic license key](/docs/apis/intro-apis/new-relic-api-keys/#ingest-license-key) directly to your Dockerfile, or use an environment variable in your `docker run` command.)
 
-    ```
+    ```dockerfile
     # base Tomcat image to build Docker image from
     FROM tomcat:8.5.14-jre8
 
@@ -109,7 +109,7 @@ This example describes how to add New Relic to your GAE flex app by installing t
     # update Java agent yml with license_key and app_name and copy to image  
     ADD newrelic.yml ${NEWRELIC_HOME}
 
-    # update catalina.sh with <a href="/docs/agents/java-agent/installation/include-java-agent-jvm-argument#tomcat-catalinash">-javaagent:/path/to/newrelic.jar</a> and copy to image 
+    # update catalina.sh with -javaagent:/path/to/newrelic.jar and copy to image 
     ADD catalina.sh /usr/local/tomcat/bin/
     ```
   </Collapser>
@@ -120,7 +120,7 @@ This example describes how to add New Relic to your GAE flex app by installing t
   >
     To build a Docker image that runs Tomcat with the New Relic Java agent monitoring your deployed application WAR, run the following command. Be sure to include the period at the end of the code, to indicate the current directory contains the build files.
 
-    ```
+    ```sh
     docker build -f Dockerfile -t newrelic-tomcat .
     ```
 
@@ -133,13 +133,13 @@ This example describes how to add New Relic to your GAE flex app by installing t
   >
     1. To deploy your Docker image to your [initialized GAE flexible environment](https://cloud.google.com/sdk/docs/initializing), run the following command:
 
-       ```
+       ```sh
        gcloud app deploy
        ```
     2. Wait until the deployment completes.
     3. To open the app in the browser, run the following command:
 
-       ```
+       ```sh
        gcloud app browse
        ```
     4. To view your GAE flex app data in New Relic, go to the [APM <DoNotTranslate>**Summary**</DoNotTranslate> page](/docs/apm/applications-menu/monitoring/apm-overview-page).
@@ -154,7 +154,7 @@ If you create a custom runtime, your app must be able to handle a large number o
 
 <DoNotTranslate>**Recommendation:**</DoNotTranslate> Configure your `app.yaml` to [disable health checks](https://cloud.google.com/appengine/docs/flexible/java/configuring-your-app-with-app-yaml#health_checks) by adding:
 
-```
+```yml
 health_check:
   enable_health_check: False
 ```
@@ -166,7 +166,7 @@ Use these resources to troubleshoot your GAE flex environment app:
 * To connect to the GAE instance and start a shell in the Docker container running your code, see [Debugging an Instance](https://cloud.google.com/appengine/docs/flexible/java/debugging-an-instance).
 * To redirect New Relic Java agent logs to [Stackdriver](http://cloud.google.com/logging/docs/view/logs_viewer_v2) in the [Cloud Platform Console](https://cloud.google.com/compute/docs/console), change the `newrelic.yml`file to:
 
-  ```
+  ```yml
   log_file_name: STDOUT
   ```
 * To view the logs, use the [Cloud Platform Console's Log Viewer](https://cloud.google.com/appengine/docs/flexible/php/writing-application-logs).