(minor) shorter code snippets for PDF

for #509

STYLEGUIDE.md

@@ -47,6 +47,9 @@ This snippet...
 
 If the result is large, use another code block, without comments.
 
+- lines should not exceed 64 characters, otherwise the PDF will truncate them and show an horizontal scrollbar.
+
+
 ## EPUB gotchas
 
 ### Embedded content

getting-started.md

@@ -461,7 +461,7 @@ Another solution is to use ASDF's list of known projects:
 
 ~~~lisp
 ;; startup file like ~/.sbclrc
-(pushnew "~/path-to/project/" asdf:*central-registry* :test #'equal)
+(pushnew "~/to/project/" asdf:*central-registry* :test #'equal)
 ~~~
 
 and since ASDF is integrated into Quicklisp, we can `quickload` our project right away.

websockets.md

@@ -132,15 +132,15 @@ that the connection has been made. Here's how it works:
 
     (lambda (responder)
       (declare (ignore responder))
-      (websocket-driver:start-connection ws)))) ; send the handshake
-
+      ;; Send the handshake:
+      (websocket-driver:start-connection ws))))
 ~~~
 
 You may now start your server, running on port `12345`:
 
 ~~~lisp
-;; keep the handler around so that you can stop your server later on
-
+;; Keep the handler around so that
+;; you can stop your server later on:
 (defvar *chat-handler* (clack:clackup #'chat-server :port 12345))
 ~~~