Documentation/sysctl/vm.txt typo

Fix trivial typo: duplicated word.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 5fdbb61..82b2da1 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -196,7 +196,7 @@
 
 legacy_va_layout
 
-If non-zero, this sysctl disables the new 32-bit mmap mmap layout - the kernel
+If non-zero, this sysctl disables the new 32-bit mmap layout - the kernel
 will use the legacy (2.4) layout for all processes.
 
 ==============================================================