Document application specific email template usage

[mooreds]

Document application specific email template usage

Description

Unclear how to start a 'forgot password' workflow which uses an application specific template.

Affects versions

1.21

Steps to reproduce

1. Create an application specific template for the forgot password flow
2. Try to start a forgot password flow: https://fusionauth.io/docs/v1/tech/apis/users/#start-forgot-password-workflow
3. You get the tenant configured email

Expected behavior

You get the application configured email template. You can get this by providing applicationId. But this needs to be documented.

Additional context

From https://fusionauth.io/community/forum/topic/555/how-to-use-application-specific-e-mail-templates

[robotdan]

Along with this change, we can audit the email template docs to ensure consistency.
https://fusionauth.io/docs/v1/tech/email-templates/email-templates/#change-password

[mooreds]

I think this is going to be handled via this issue: FusionAuth/fusionauth-site#785