[CCI] Adding second command to Install yarn step in Developer Guide

DEVELOPER_GUIDE.md

@@ -67,6 +67,10 @@ If it's the only version of node installed, it will automatically be set to the
 $ npm i -g corepack
 ```
 
+```bash
+$ corepack prepare yarn@<version> --activate
+```
+
 (See the [Yarn installation documentation](https://yarnpkg.com/getting-started/install) for more information.)
 
 ### Fork and clone OpenSearch Dashboards
@@ -111,6 +115,7 @@ $ yarn osd clean
 OpenSearch Dashboards requires a running version of OpenSearch to connect to. In a separate terminal you can run the latest snapshot built using:
 
 _(Linux, Windows, Darwin (MacOS) only - for others, you'll need to [set up using Docker](https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/docs/docker-dev/docker-dev-setup-manual.md) or [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
+
 ```bash
 $ yarn opensearch snapshot
 ```
@@ -185,6 +190,7 @@ By default, the snapshot command will run [a minimal distribution of OpenSearch]
 If you would like to run OpenSearch with a particular plugin installed on the cluster snapshot, pass the `--P` flag after `yarn opensearch snapshot`. You can use the flag multiple times to install multiple plugins. The argument value can be a URL to the plugin's zip file, maven coordinates of the plugin, or a local zip file path (use `file://` followed by the absolute or relative path, in that case). For example:
 
 _(Linux, Windows, Darwin (MacOS) only - for others, you'll need to [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
+
 ```bash
 $ yarn opensearch snapshot --P https://repo1.maven.org/maven2/org/opensearch/plugin/opensearch-test-plugin/2.4.0.0/opensearch-test-plugin-2.4.0.0.zip
 ```
@@ -227,15 +233,15 @@ This method can also be used to develop against the [full distribution of OpenSe
 
 ### Configure OpenSearch Dashboards for security
 
-*This step is only mandatory if you have the [`security` plugin](https://github.com/opensearch-project/security) installed on your OpenSearch cluster with https/authentication enabled.*
+_This step is only mandatory if you have the [`security` plugin](https://github.com/opensearch-project/security) installed on your OpenSearch cluster with https/authentication enabled._
 
 Once the bootstrap of OpenSearch Dashboards is finished, you need to apply some
 changes to the default [`opensearch_dashboards.yml`](https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/config/opensearch_dashboards.yml#L25-L72) in order to connect to OpenSearch.
 
 ```yml
-opensearch.hosts: ["https://localhost:9200"]
-opensearch.username: "admin" # Default username on the docker image
-opensearch.password: "admin" # Default password on the docker image
+opensearch.hosts: ['https://localhost:9200']
+opensearch.username: 'admin' # Default username on the docker image
+opensearch.password: 'admin' # Default password on the docker image
 opensearch.ssl.verificationMode: none
 ```
 
@@ -258,10 +264,11 @@ yarn build-platform --darwin
 You could pass one or multiple flags. If you don't pass any flag, `yarn build-platform` will build an artifact based on your local environment.
 
 Currently, the supported flags for this script are:
-* `darwin` (builds Darwin x64)
-* `linux` (builds Linux x64)
-* `linux-arm` (builds Linux ARM64).
-* `windows` (builds Windows x64)
+
+- `darwin` (builds Darwin x64)
+- `linux` (builds Linux x64)
+- `linux-arm` (builds Linux ARM64).
+- `windows` (builds Windows x64)
 
 If you would like to build only a DEB x64 artifact, run the following:
 
@@ -334,9 +341,7 @@ This part contains developer guide rules around general (framework agnostic) HTM
 Use camel case for the values of attributes such as `id` and `data-test-subj` selectors.
 
 ```html
-<button id="veryImportantButton" data-test-subj="clickMeButton">
-  Click me
-</button>
+<button id="veryImportantButton" data-test-subj="clickMeButton">Click me</button>
 ```
 
 The only exception is in cases where you're dynamically creating the value, and you need to use
@@ -432,10 +437,8 @@ import './component.scss';
 // All other imports below the SASS import
 
 export const Component = () => {
-  return (
-    <div className="plgComponent" />
-  );
-}
+  return <div className="plgComponent" />;
+};
 ```
 
 ```scss
@@ -446,7 +449,6 @@ export const Component = () => {
 
 Do not use the underscore `_` SASS file naming pattern when importing directly into a javascript file.
 
-
 ### TypeScript/JavaScript
 
 The following developer guide rules apply for working with TypeScript/JavaScript files.