Syntaxt fix on clientId

Author: blueboxes

README.md

@@ -86,7 +86,7 @@ npm install msal@<version>
 ```typescript
 import { MSALAuthenticationProvider } from "./node_modules/@microsoft/microsoft-graph-client/lib/src/MSALAuthenticationProvider";
 
-const clientID = "your_client_id"; // Client Id of the registered application
+const clientId = "your_client_id"; // Client Id of the registered application
 const graphScopes = ["user.read", "mail.send"]; // An array of graph scopes
 const options = {
 	// An Optional options for initializing the MSAL @see https://github.com/AzureAD/microsoft-authentication-library-for-js/wiki/MSAL-basics#configuration-options