Reword "cleaning the repo" in README

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

Change-Id: Iade61217337077e7a979732482a7cf155bd16d08
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
index 32f0adb..687af8b 100644
--- a/README.md
+++ b/README.md
@@ -11,5 +11,5 @@
     2. ./configure ${CONFIGURE_FLAGS}
     3. make
 
-To full clean the repository again run `./bootstrap.sh clean`.
+To clean the repository run `./bootstrap.sh clean`.
 ```