Update concept-github-action.md

Author: zhenlan

articles/azure-app-configuration/concept-github-action.md

@@ -307,7 +307,7 @@ Input parameters specify data used by the action during runtime.  The following
 |----|----|----|
 | configurationFile | Yes | Relative path to the configuration file in the repository.  Glob patterns are supported and can include multiple files. |
 | format | Yes | File format of the configuration file.  Valid formats are: JSON, YAML, properties. |
-| connectionString | Yes | Connection string for the App Configuration instance. The connection string should be stored as a secret in the GitHub repository, and only the secret name should be used in the workflow. |
+| connectionString | Yes | Read-write connection string for the App Configuration instance. The connection string should be stored as a secret in the GitHub repository, and only the secret name should be used in the workflow. |
 | separator | Yes | Separator used when flattening the configuration file to key-value pairs.  Valid values are: . , ; : - _ __ / |
 | prefix | No | Prefix to be added to the start of keys. |
 | label | No | Label used when setting key-value pairs. If unspecified, a null label is used. |