Typo. Patch by Nicklas Bo Jensen <nbjensen@gmail.com>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157415 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/FileCheck.rst b/docs/CommandGuide/FileCheck.rst
index e7076c2..c0f64a4 100644
--- a/docs/CommandGuide/FileCheck.rst
+++ b/docs/CommandGuide/FileCheck.rst
@@ -265,7 +265,7 @@
 
    ; CHECK: test5:
    ; CHECK:    notw	[[REGISTER:%[a-z]+]]
-   ; CHECK:    andw	{{.*}}[REGISTER]]
+   ; CHECK:    andw	{{.*}}[[REGISTER]]
 
 
 The first check line matches a regex (**%[a-z]+**) and captures it into