update error mesage

Author: zhiyuanliang-ms

src/AzureAppConfigurationImpl.ts

@@ -176,7 +176,7 @@ export class AzureAppConfigurationImpl implements AzureAppConfiguration {
             const { secretRefreshIntervalInMs } = options.keyVaultOptions;
             if (secretRefreshIntervalInMs !== undefined) {
                 if (secretRefreshIntervalInMs < MIN_SECRET_REFRESH_INTERVAL_IN_MS) {
-                    throw new RangeError(`The key vault secret refresh interval cannot be less than ${MIN_SECRET_REFRESH_INTERVAL_IN_MS} milliseconds.`);
+                    throw new RangeError(`The Key Vault secret refresh interval cannot be less than ${MIN_SECRET_REFRESH_INTERVAL_IN_MS} milliseconds.`);
                 }
                 this.#secretRefreshEnabled = true;
                 this.#secretRefreshTimer = new RefreshTimer(secretRefreshIntervalInMs);

test/keyvault.test.ts

@@ -155,7 +155,7 @@ describe("key vault secret refresh", function () {
                 secretRefreshIntervalInMs: 59999 // less than 60_000 milliseconds
             }
         });
-        return expect(loadWithInvalidSecretRefreshInterval).eventually.rejectedWith("The key vault secret refresh interval cannot be less than 60000 milliseconds.");
+        return expect(loadWithInvalidSecretRefreshInterval).eventually.rejectedWith("The Key Vault secret refresh interval cannot be less than 60000 milliseconds.");
     });
 
     it("should reload key vault secret when there is no change to key-values", async () => {