Merge pull request #7188 from ddevsr/session-wrong-header

docs: fix wrong header configure `MemcachedHandler` in `Session`

Author: samsonasik

user_guide_src/source/libraries/sessions.rst

@@ -671,8 +671,8 @@ deleted after Y seconds have passed (but not necessarily that it won't
 expire earlier than that time). This happens very rarely, but should be
 considered as it may result in loss of sessions.
 
-Configure RedisHandler
-----------------------
+Configure MemcachedHandler
+--------------------------
 
 The ``$savePath`` format is fairly straightforward here,
 being just a ``host:port`` pair: