fix README for getting the password from secret.

Author: pengzhouml

README.md

@@ -243,7 +243,7 @@ Identify the name of the secret.
 
 2. Save the secret name from step 1 and get the admin password using the following script:
 ```
-kubectl get secret SECRET_NAME -o jsonpath='{.data.marklogic-password}' | base64 --decode
+kubectl get secret SECRET_NAME -o jsonpath='{.data.password}' | base64 --decode
 ```
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