Tidy up base element:

Fix a typo in the base element itself.
Refer to it early in the README since it is likely to be useful to
almost everyone.

Change-Id: I4a753b61542f8a354ade7fcc4436076aec61e6c0

README.md

@@ -9,7 +9,8 @@ What tools are there?
 ---------------------
 
 * disk-image-create -o filename {element} [{element} ...] : Create an image of
-  element {element}, optionally mixing in other elements.
+  element {element}, optionally mixing in other elements. You will usually want
+  to include the "base" element in your image.
 
 * ramdisk-image-create -o filename {element} [{element} ...] : Create a kernel+
   ramdisk pair for running maintenance on bare metal machines (deployment,

elements/base/install.d/00-baseline-environment

@@ -1,5 +1,5 @@
 #!/bin/bash
-# These are useful, or at worst not harmful, for all imges we build.
+# These are useful, or at worst not harmful, for all images we build.
 
 set -e