Fix some minor typos

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161037 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/HowToReleaseLLVM.html b/docs/HowToReleaseLLVM.html
index 382e18f..30c3d5d 100644
--- a/docs/HowToReleaseLLVM.html
+++ b/docs/HowToReleaseLLVM.html
@@ -476,7 +476,7 @@
 <p>Review the documentation and ensure that it is up to date. The "Release
    Notes" must be updated to reflect new features, bug fixes, new known issues,
    and changes in the list of supported platforms. The "Getting Started Guide"
-   should be updated to reflect the new release version number tag avaiable from
+   should be updated to reflect the new release version number tag available from
    Subversion and changes in basic system requirements. Merge both changes from
    mainline into the release branch.</p>