README: Reword cleaning the repo

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

Change-Id: Ieb58e0b57d3527a93e62d06670854b1800da18ca
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/README.md b/README.md
index a352eed..aa293b5 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,4 @@
     2. ./configure ${CONFIGURE_FLAGS}
     3. make
 
-To full clean the repository again run `./bootstrap.sh clean`.
+To clean the repository run `./bootstrap.sh clean`.