DOC: fix references to the section about the unix socket

The unix socket is documented in 9.3, not 9.2 of the management guide.

This should be backported to 1.7.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 082b857..d7ffd3f 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -935,7 +935,7 @@
   Binds a UNIX socket to <path> or a TCPv4/v6 address to <address:port>.
   Connections to this socket will return various statistics outputs and even
   allow some commands to be issued to change some runtime settings. Please
-  consult section 9.2 "Unix Socket commands" of Management Guide for more
+  consult section 9.3 "Unix Socket commands" of Management Guide for more
   details.
 
   All parameters supported by "bind" lines are supported, for instance to
@@ -4673,7 +4673,7 @@
 
   The format of the file is versionned and is very specific. To understand it,
   please read the documentation of the "show servers state" command (chapter
-  9.2 of Management Guide).
+  9.3 of Management Guide).
 
   Arguments:
     global     load the content of the file pointed by the global directive