DOC: Fix copy and paste mistake in http-response replace-value doc
This fixes up commit 2252beb8557d73407b8f96eef91d6927fb855685.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 1d9b3d1..a13364e 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -5056,7 +5056,7 @@
http-response replace-value <name> <regex-match> <replace-fmt>
[ { if | unless } <condition> ]
- This works like "http-response replace-value" except that it works on the
+ This works like "http-request replace-value" except that it works on the
server's response instead of the client's request.
Example: