Fix typo, patch from Timo Juhani Lindfors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83848 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/WritingAnLLVMPass.html b/docs/WritingAnLLVMPass.html
index f715a96..c9a7edb 100644
--- a/docs/WritingAnLLVMPass.html
+++ b/docs/WritingAnLLVMPass.html
@@ -179,7 +179,7 @@
 <div class="doc_code"><pre>
 # Makefile for hello pass
 
-# Path to top level of LLVM heirarchy
+# Path to top level of LLVM hierarchy
 LEVEL = ../../..
 
 # Name of the library to build