Fix typo in docs.

Change-Id: I3917467cc338dee5ae7ff5e221f7980c761b92fb
diff --git a/docs/Testing.md b/docs/Testing.md
index 6521264..1b66e83 100644
--- a/docs/Testing.md
+++ b/docs/Testing.md
@@ -25,7 +25,7 @@
 
 ### `hftest`
 
-Having a framework for tests makes them easier to read and write. `hftest` in a
+Having a framework for tests makes them easier to read and write. `hftest` is a
 framework to meet the needs of VM based tests for Hafnium. It consists of:
 
    * assertions