precision for restsessionbackend and restconfbackend with "authbasic" protection

doc/sources/admin/restconfbackend.rst

@@ -77,3 +77,7 @@ You can also add some other parameters
    # LWP::UserAgent parameters
    proxyOptions = { timeout => 5 }
 
+`User` and `Password` parameters are only used if the entry point `index.fcgi/config`
+is protected by a basic authentication. Thus, handlers will make requests to the portal
+using these parameters.
+

doc/sources/admin/restsessionbackend.rst

@@ -68,6 +68,10 @@ Name                Comment                                  Example
 **password**        Password to use for auth basic mechanism
 =================== ======================================== ==================================================
 
+`user` and `password` parameters are only used if the entry point `index.fcgi/sessions/global`
+is protected by a basic authentication. Thus, handlers will make requests to the portal
+using these parameters.
+
 
 .. attention::