README: Reword cleaning the repo

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

Change-Id: I129faed7b8de5781c4f67e77be6122937e4a6e5d
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
index 36c1042..ebbe25e 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,4 @@
     2. ./configure ${CONFIGURE_FLAGS}
     3. make
 
-To full clean the repository again run `./bootstrap.sh clean`.
+To clean the repository run `./bootstrap.sh clean`.