DOC: fix a few typos in the documentation
This commit deals with a few misspells in the documentation.
diff --git a/doc/architecture.txt b/doc/architecture.txt
index 0c26038..85d5219 100644
--- a/doc/architecture.txt
+++ b/doc/architecture.txt
@@ -509,7 +509,7 @@
servers (freeing even more resources) and installed on the load-balancer
itself. Install haproxy and apache+mod_ssl on the old box which will spread the
load between the new boxes. Apache will work in SSL reverse-proxy-cache. If the
-application is correctly developped, it might even lower its load. However,
+application is correctly developed, it might even lower its load. However,
since there now is a cache between the clients and haproxy, some security
measures must be taken to ensure that inserted cookies will not be cached.