Branding: attribute filter instructions URL

Hi Bradley,

While doing a final review of our branding, I have found a few minor issues around the attribute filter instructions:
113fc3e: The link to the Automating Attribute Release KB article was incorrect (pointing to a non-existent page) in the IdP activated notification email; I have used the one from the IdP detail -> SAML -> Attribute filter page instead.
e99d046: in the same email template, change the reference to UNIQUEURL to INTERNALID instead (as used in the KB article to construct the URL on the DS)
961643f: the text on the IdP detail -> SAML -> Attribute filter page should actually move into Branding (messages-branding.properties)

Hope these will be easy to integrate.

Cheers,
Vlad