Update ARCOptimization.rst (swiftlang#24724)

0xflotus · gottesmm · commit ca3449568f13 · 2019-05-14T12:57:13.000-07:00
* Update ARCOptimization.rst

* Update ARCOptimization.rst
diff --git a/docs/ARCOptimization.rst b/docs/ARCOptimization.rst
@@ -439,8 +439,8 @@ In the following we assume that all loops are canonicalized such that:
 2. The loop has one backedge.
 3. All exiting edges have a unique exit block.
 
-Motiviation
------------
+Motivation
+----------
 
 Consider the following simple loop::
 
