Fix test assert description

Author: danielebogo

WordPressKitTests/AccountSettingsRemoteTests.swift

@@ -62,7 +62,7 @@ class AccountSettingsRemoteTests: RemoteTestCase, RESTTestable {
         stubRemoteResponse(meSettingsEndpoint, filename: getAccountSettingsSuccessMockFilename, contentType: .ApplicationJSON)
         remote.getSettings(success: { settings in
             XCTAssertEqual(settings.username, self.username, "The usernames should be equal.")
-            XCTAssertEqual(settings.usernameCanBeChanged, false, "The usernames should be equal.")
+            XCTAssertEqual(settings.usernameCanBeChanged, false, "The usernames can't be changed and its value must be false")
             XCTAssertEqual(settings.email, self.email, "The email addresses should be equal.")
             XCTAssertEqual(settings.webAddress, self.userURL, "The web addresses should be equal.")
             XCTAssertEqual(settings.primarySiteID, self.siteID, "The primary site ID's should be equal.")