Cleanup tools scripts

* whitespace and comment cleanups only

Change-Id: I4e631e9a9b8151758dc8c96b3aef76b963d5ea7e
diff --git a/tools/build_pxe_env.sh b/tools/build_pxe_env.sh
index d01dad0..e6f98b4 100755
--- a/tools/build_pxe_env.sh
+++ b/tools/build_pxe_env.sh
@@ -1,5 +1,8 @@
 #!/bin/bash -e
-# build_pxe_env.sh - Create a PXE boot environment
+
+# **build_pxe_env.sh**
+
+# Create a PXE boot environment
 #
 # build_pxe_env.sh destdir
 #