MQE-1671: document using credentials with vault in MFTF tests

Author: jilu1

docs/configuration.md

@@ -204,7 +204,7 @@ Example:
 FW_BP=~/magento/magento2-functional-testing-framework
 ```
 
-## TESTS_MODULE_PATH
+### TESTS_MODULE_PATH
 
 The path to where the MFTF modules mirror Magento modules.
 
@@ -239,7 +239,7 @@ Modify the default value:
 
 Example: `dev/tests/acceptance/utils/command.php`
 
-## BROWSER
+### BROWSER
 
 Override the default browser performing the tests.
 
@@ -251,7 +251,7 @@ Example:
 BROWSER=firefox
 ```
 
-## CREDENTIAL_VAULT_ADDRESS
+### CREDENTIAL_VAULT_ADDRESS
 
 The Api address for a vault server.
 
@@ -264,7 +264,7 @@ Example:
 CREDENTIAL_VAULT_ADDRESS=http://127.0.0.1:8200
 ```
 
-## CREDENTIAL_VAULT_SECRET_BASE_PATH
+### CREDENTIAL_VAULT_SECRET_BASE_PATH
 
 Vault secret engine base path.
 

docs/credentials.md

@@ -98,7 +98,7 @@ vault login -method -path
 The MFTF uses the `KV Version 2` secret engine for secret storage. 
 More information for working with `KV Version 2` can be found in [Vault KV2][Vault KV2]. 
 
-### Secrets path and key convention
+#### Secrets path and key convention
 
 The path and key for secret data must follow the format:
 
@@ -114,7 +114,7 @@ secret/mftf/magento/carriers_usps_userid
 secret/mftf/magento/carriers_usps_password
 ```
 
-### Write secrets to vault
+#### Write secrets to vault
 
 You can use vault CLI or API to write secret data (credentials, etc) to vault. Here is a CLI example: