Remove mentions of the removed files provider

Author: sumit-bose

src/docs/introduction.rst

@@ -42,7 +42,7 @@ solutions using the LDAP provider (for pure LDAP servers) and the Kerberos
 provider (for Kerberos authentication instead of plain passwords).
 Additionally, some OAuth2.0/OIDC based Identity Providers (IdPs) are supported
 via the IdP provider. It can also directly integrate with local users using the
-files provider.
+proxy provider.
 
 .. note::
 
@@ -59,7 +59,6 @@ files provider.
     - `man sssd-ipa <https://www.mankier.com/5/sssd-ipa>`_
     - `man sssd-ad <https://www.mankier.com/5/sssd-ad>`_
     - `man sssd-idp <https://www.mankier.com/5/sssd-idp>`_
-    - `man sssd-files <https://www.mankier.com/5/sssd-files>`_
 
     For more information about FreeIPA and other compatible directory servers,
     please check out the following links.