docs: unaligned-memory-access.txt: use a lowercase title

As all other titles at the documentation, use lower case
for its title.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/unaligned-memory-access.txt b/Documentation/unaligned-memory-access.txt
index 51b4ff0..1ee8241 100644
--- a/Documentation/unaligned-memory-access.txt
+++ b/Documentation/unaligned-memory-access.txt
@@ -1,5 +1,5 @@
 =========================
-UNALIGNED MEMORY ACCESSES
+Unaligned Memory Accesses
 =========================
 
 :Author: Daniel Drake <dsd@gentoo.org>,