Add missing "-" to the command line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115777 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 0b638b3..7cb7b5c 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -673,7 +673,7 @@
     be 13 in one of the predecessors of a block.  It does this in conjunction
     with the new LazyValueInfo analysis pass.</li>
 <li>The new RegionInfo analysis pass identifies single-entry single-exit regions
-    in the CFG.  You can play with it with the "opt -regions analyze" or
+    in the CFG.  You can play with it with the "opt -regions -analyze" or
     "opt -view-regions" commands.</li>
 <li>The loop optimizer has significantly improved strength reduction and analysis
   capabilities.  Notably it is able to build on the trap value and signed