DOC: relax the peers restriction to single-process

(cherry picked from commit 1abc6731ed0f5c81497853a01b43c69b33cc3356)
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 6f5eeb1..7007d56 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -6911,7 +6911,8 @@
                automatically learned from the local peer (old process) during a
                soft restart.
 
-               NOTE : peers can't be used in multi-process mode.
+               NOTE : each peers section may be referenced only by tables
+                      belonging to the same unique process.
 
     <expire>   defines the maximum duration of an entry in the table since it
                was last created, refreshed or matched. The expiration delay is