Improve README.org

- Spelling improvements
- Add syntax highlighting to configuration
- Improve wording where needed.

README.org

@@ -1,6 +1,12 @@
 * ob-tmux
 Ob-tmux is an Emacs library that allows org mode to evaluate code
 blocks in a tmux session.
+
+Ob-tmux is useful for keeping notes on how to perform tasks in the
+terminal, especially when some interactivity is required. The
+functionality can be used to document software installation, build
+instructions, and administrative tasks. The documentation can be
+tested and adjusted while it is written.
 * Installation
 Unfortunately, ob-tmux has not yet been added to melpa. You will need
 to copy the ~ob-tmux.el~ file to a directory in your ~load-path~.
@@ -18,17 +24,22 @@ In your ~.emacs~ or ~.emacs.d/init.el~ file, add the following:
   ;; You can customize this if you like.
   (setq org-babel-tmux-session-prefix "org-babel-session-")
 
-  ;; Finally, if you tmux is not in your $PATH for whatever reason, you
+  ;; Syntax highlighting can be added with the following line:
+  (add-to-list 'org-src-lang-modes (cons "tmux" 'sh))
+
+  ;; Finally, if your tmux is not in your $PATH for whatever reason, you
   ;; may set the path to the tmux binary as follows:
   (setq org-babel-tmux-location "/usr/bin/tmux")
+
+
 #+END_SRC
 * Usage
 You can start a new terminal window with a tmux session as follows:
 : #+BEGIN_SRC tmux :session hello
 : echo hello
 : #+END_SRC
-If you press =C-c C-c= with your point in the code block, a new
-terminal window will pop up with a new tmux session named
+If you press =C-c C-c= with your point in the code block, a terminal
+window will pop up with a new tmux session named
 =org-babel-session-hello=.
 
 You can continue work in this session with another code block.
@@ -38,8 +49,11 @@ You can continue work in this session with another code block.
 If you press =C-c C-c= now, no new terminal window will open, but the
 code will be sent to the existing tmux session.
 
-You can open new windows within the existing session using the
-familiar tmux syntax.
+You can also specify to which tmux window the source block should be
+sent. If the tmux window does not yet exist, ob-tmux will create it.
+To specify the window, you may use the tmux target syntax. In the
+following example, the ~:session~ argument has been changed to
+=hello:new-world=:
 : #+BEGIN_SRC tmux :session hello:new-window
 : echo hello world in new-window
 : #+END_SRC
@@ -48,15 +62,12 @@ session.
 
 You can exit your tmux session by detaching. The terminal window will
 close automatically. Ob-tmux will not detect that you have
-detached. Any commands you send will be sent in the background. You
-can reattach to your tmux session at any time and check that the
-commands have indeed been executed.
-
-Ob-tmux is useful for keeping notes on how to install software
-or perform tasks in the terminal, especially when some interactivity
-is required. It is also very useful for starting up your tmux
-sessions after a reboot. Take a Look at the following snippet.
+detached. Any commands you send will be sent to the tmux session in
+the background. You can reattach to your tmux session at any time and
+check that the commands have indeed been executed.
 
+*Tip*. Ob-tmux is also very useful for restarting your tmux sessions
+after a reboot. Take a Look at the following snippet.
 : ** Startup tmux
 : Use ~C-c C-v s~ to execute subtree.
 : *** Jupyter
@@ -72,17 +83,16 @@ sessions after a reboot. Take a Look at the following snippet.
 : #+BEGIN_SRC tmux :session daemons:dmesg
 : dmesg
 : #+END_SRC
-
 If your point is on the =Startup tmux= header, you can execute all
-code blocks in the subtree with ~C-c C-v s~ to jump start your tmux
-sessions.
+code blocks in the subtree with ~C-c C-v s~ to restart your favorite
+tmux sessions.
 
 * Known bugs and or possible issues
 My tmux indexes start at 1. By default, tmux window indexes start at
 zero. This might lead to problems. I have not yet checked.
 
 Terminals other than xterm and gnome-terminal have not been
-checked. If you have positive or negative experiences with any other
+tested. If you have positive or negative experiences with any other
 terminal, let me know.
 
 I will try to respond within a week to any issues raised. I cannot