Reword "cleaning the repo" in README

Reworded cleaning the repo. The old wording did not make sense.

Change-Id: If386a79dc1f4e6bb9546ec4590e4879551c5f055
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
index 5318177..44e811c 100644
--- a/README.md
+++ b/README.md
@@ -6,5 +6,5 @@
     2. ./configure ${CONFIGURE_FLAGS}
     3. make
 
-To full clean the repository again run `./bootstrap.sh clean`.
+To clean the repository run `./bootstrap.sh clean`.
 ```