DOC: typo on stick-store response

It is used to store responses, and not requests.

backport: 1.5 and above
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 9f0b1e0..42faa56 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -8240,7 +8240,7 @@
 
 
 stick store-response <pattern> [table <table>] [{if | unless} <condition>]
-  Define a request pattern used to create an entry in a stickiness table
+  Define a response pattern used to create an entry in a stickiness table
   May be used in sections :   defaults | frontend | listen | backend
                                  no    |    no    |   yes  |   yes