Describe support for url in postman and har

Update new support for input documents in
HAR and postman collection specification.

doc/user/application_security/api_fuzzing/index.md

@@ -209,7 +209,8 @@ target API to test:
      FUZZAPI_PROFILE: Quick-10
    ```
 
-1. Add the `FUZZAPI_HAR` variable and set it to the HAR file's location:
+1. Provide the location of the HAR specification. You can provide the specification as a file
+   or URL. [URL support was introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/285020) in GitLab 13.10 and later. Specify the location by adding the `FUZZAPI_HAR` variable:
 
    ```yaml
    include:
@@ -300,7 +301,8 @@ information about the target API to test:
      FUZZAPI_PROFILE: Quick-10
    ```
 
-1. Add the `FUZZAPI_POSTMAN_COLLECTION` variable and set it to the Postman Collection's location:
+1. Provide the location of the Postman Collection specification. You can provide the specification as a file
+   or URL. [URL support was introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/285020) in GitLab 13.10 and later. Specify the location by adding the `FUZZAPI_POSTMAN_COLLECTION` variable:
 
    ```yaml
    include: