Update roundtrip.rst

Updated documentation to point to mpw-5a
diff --git a/docs/source/roundtrip.rst b/docs/source/roundtrip.rst
index cc68ebc..899d357 100644
--- a/docs/source/roundtrip.rst
+++ b/docs/source/roundtrip.rst
@@ -38,7 +38,7 @@
 .. code:: bash
 	
 	# Make sure that ``caravel_example`` matches the empty github repo name in step 1
-	git clone -b mpw-5 https://github.com/efabless/caravel_user_project caravel_example
+	git clone -b mpw-5a https://github.com/efabless/caravel_user_project caravel_example
 	cd caravel_example
 	git remote rename origin upstream