Update web-api-functional-testing.md (#8368)

* Update web-api-functional-testing.md

Added phpunit_rest.xml Web API functional test.

* Update web-api-functional-testing.md

* Update web-api-functional-testing.md

* trying to address the linting errors

* trying again

Co-authored-by: Kevin Harper <[email protected]>

Author: RakeshJesadiya

src/guides/v2.3/get-started/web-api-functional-testing.md

@@ -99,15 +99,21 @@ interface AdapterInterface
 
 ### Running the Tests {#running}
 
-1. Copy `/dev/tests/api-functional/phpunit_rest.xml.dist` and `phpunit_soap.xml.dist` to `/dev/tests/api-functional/phpunit_rest.xml` and `phpunit_soap.xml`.
+1. Copy `dev/tests/api-functional/phpunit_rest.xml.dist` and `phpunit_soap.xml.dist` to `dev/tests/api-functional/phpunit_rest.xml` and `phpunit_soap.xml`.
 
 1. Define the Magento instance URL as a value of `TESTS_BASE_URL`, Test Webservice User as value of `TESTS_WEBSERVICE_USER` and Test Webservice API key as value of `TESTS_WEBSERVICE_APIKEY` in copied file i.e. `phpunit_rest.xml` or `phpunit_soap.xml`.
 
-1. Copy `/dev/tests/api-functional/config/install-config-mysql.php.dist` to `/dev/tests/api-functional/config/install-config-mysql.php`.
+1. Copy `dev/tests/api-functional/config/install-config-mysql.php.dist` to `dev/tests/api-functional/config/install-config-mysql.php`.
 
-1. Configure your DB connection and install settings in `/dev/tests/api-functional/config/install-config-mysql.php`. Specify the Magento database. The base URL to access this Magento instance must be the same specified in the `phpunit_rest.xml` or `phpunit_soap.xml` file.
+1. Configure your DB connection and install settings in `dev/tests/api-functional/config/install-config-mysql.php`. Specify the Magento database. The base URL to access this Magento instance must be the same specified in the `phpunit_rest.xml` or `phpunit_soap.xml` file.
 
-1. Run `phpunit` using the `/dev/tests/api-functional/phpunit_rest.xml` or `/dev/tests/api-functional/phpunit_soap.xml` configuration file:
+1. Run `phpunit` using the `dev/tests/api-functional/phpunit_rest.xml` or `dev/tests/api-functional/phpunit_soap.xml` configuration file::
+
+   ```bash
+   vendor/bin/phpunit --config ./dev/tests/api-functional/phpunit_rest.xml
+   ```
+
+   or
 
    ```bash
    vendor/bin/phpunit --config ./dev/tests/api-functional/phpunit_soap.xml