Improve some wording in the README

Author: bbatsov

README.md

@@ -136,39 +136,42 @@ for the symbol you want to show the docstring for.
 
 ## Configuration
 
-## Most Common Configuration
+**Note:** The configuration options were changed massively in `inf-clojure` 3.0.
+
+In the time-honoured Emacs tradition `inf-clojure`'s behaviour is extremely
+configurable.
+
+You can set custom values to `inf-clojure` variables on a
+per-project basis using [directory
+variables](https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html)
+or by setting them in in your init file.
+
+You can see all the configuration options available using the command
+`M-x customize-group RET inf-clojure`.
+
+### Startup
 
 Most likely you will want to set the startup command and the repl
-type. This is most easily set with the follow dir-locals
+type. This is most easily set with the following `dir-locals.el`:
 
 ```emacs-lisp
 ((nil
   (inf-clojure-custom-startup . "clojure -A:compliment")
   (inf-clojure-custom-repl-type . clojure)))
 ```
 
-There are two important commands here:
-1. `inf-clojure-custom-startup`: Which startup command to use so
-   inf-clojure can run the inferior process and
-2. `inf-clojure-custom-repl-type`: Which repl type it is so
-   inf-clojure knows how to format commands to the repl
+**Note:** This file has to be in the directory in which you're invoking `inf-clojure`.
 
-If these are set and you wish to prevent inf-clojure from using them,
-use a prefix arg when invoking `inf-clojure`.
-
-### All Configuration
-**Note:** The configuration options were changed massively in `inf-clojure` 3.0.
+There are two important configuration variables here:
 
-In the time-honoured Emacs tradition `inf-clojure`'s behaviour is extremely
-configurable.
+1. `inf-clojure-custom-startup`: Which startup command to use so
+   inf-clojure can run the inferior Clojure process (REPL).
+2. `inf-clojure-custom-repl-type`: The type of the REPL started by the above command (e.g. `lumo`).
 
-You can set custom values to `inf-clojure` variables on a
-per-project basis using [directory
-variables](https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html)
-or by setting them in in your init file.
+If these are set and you wish to prevent inf-clojure from using them,
+use a prefix arg when invoking `inf-clojure` (`C-u M-x inf-clojure`).
 
-You can see all the configuration options available using the command
-`M-x customize-group RET inf-clojure`.
+### REPL Features
 
 The supported REPL-features are in an alist called
 `inc-clojure-repl-features` and it has the following shape: