Minor fixes to DAST API documentation

doc/user/application_security/dast/index.md

@@ -328,6 +328,8 @@ Vulnerability rules in an API scan are different than those in a normal website
 
 A new DAST API scanning engine is available in GitLab 13.12 and later. For more details, see [DAST API scanning engine](../dast_api). The new scanning engine supports REST, SOAP, GraphQL, and generic APIs using forms, XML, and JSON. Testing can be performed using OpenAPI, Postman Collections, and HTTP Archive (HAR) documents.
 
+The target API instance’s base URL is provided by using the `DAST_API_TARGET_URL` variable or an `environment_url.txt` file.
+
 #### Specification format
 
 API scans support OpenAPI V2 and OpenAPI V3 specifications. You can define these specifications using `JSON` or `YAML`.
@@ -339,7 +341,7 @@ The specification does not have to be hosted on the same host as the API being t
 
 ```yaml
 include:
-  - template: DAST.gitlab-ci.yml
+  - template: DAST-API.gitlab-ci.yml
 
 variables:
   DAST_API_OPENAPI: http://my.api/api-specification.yml
@@ -390,7 +392,7 @@ the following DAST configuration can be used:
 
 ```yaml
 include:
-  - template: DAST.gitlab-ci.yml
+  - template: DAST-API.gitlab-ci.yml
 
 variables:
   DAST_API_OPENAPI: http://api-test.host.com/api-specification.yml
@@ -405,7 +407,7 @@ Headers are applied to every request DAST makes.
 
 ```yaml
 include:
-  - template: DAST.gitlab-ci.yml
+  - template: DAST-API.gitlab-ci.yml
 
 variables:
   DAST_API_OPENAPI: http://api-test.api.com/api-specification.yml