Fix FEEDS definition thinko and tweak some more docs.

docs/hacking.md

 used. A theme consists of a directory under "themes/" containing css,
 images, and at least 3 templates: Base, Index, and Post.
 
-**Coleslaw** exclusively uses
+**Coleslaw** uses
 [cl-closure-template](https://github.com/archimag/cl-closure-template)
-for templating which is a well documented CL implementation of
-Google's Closure Templates. Each template file should be in a
-namespace like `coleslaw.theme.theme-name`.
+exclusively for templating. **cl-closure-template** is a well
+documented CL implementation of Google's Closure Templates. Each
+template file should contain a namespace like
+`coleslaw.theme.theme-name`.
 
 Each template creates a lisp function in the theme's package when
 loaded. These functions take a property list (or plist) as an argument

src/indexes.lisp

 (defclass numeric-index (index) ())
 
 (defclass feed (index)
-  (format :initform nil :initarg :format :accessor feed-format))
+  ((format :initform nil :initarg :format :accessor feed-format)))
 (defclass tag-feed (feed) ())
 
 (defmethod page-url ((object tag-index))