Add additional example to documentation

[bvwidt]

I have added another example that I find is missing from the documentation in order to implement MSAL for Angular in any project.

[bvwidt]

Can anyone review this small documentation change (@jo-arroyo, @tnorling or @peterzenz)?

[jo-arroyo]

@bvwidt Thank you for your interest in contributing to our library. Unfortunately, the html tags you are looking to add aren't strictly necessary for every application using MSAL Angular. While it is needed for applications using the MsalRedirectComponent, applications using popup or standalone Angular applications won't need them, so we will not be adding it to our initialization doc. Please see our doc on redirects for more details, and we welcome contributions from you in the future.