minor symfony#10524 Removed an unnecessary (and outdated) reference (javiereguiluz)

This PR was merged into the 2.8 branch.

Discussion
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Removed an unnecessary (and outdated) reference

Fixes the error discussed in symfony#10518.

Commits
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ab3a59e Removed an unnecessary (and outdated) reference

Author: javiereguiluz

security/multiple_guard_authenticators.rst

@@ -78,9 +78,6 @@ This is how your security configuration can look in action:
             ),
         ));
 
-If your authenticators need separate providers, you will need to create a 
-:doc:`chain of user providers </security/multiple_user_providers>`.
-
 There is one limitation with this approach - you have to use exactly one entry point.
 
 Multiple Authenticators with Separate Entry Points