Updated basics slides.

basics/basics.tex

@@ -146,7 +146,8 @@
     $ git commit
   \end{lstlisting}
 
-  This will open an editor, give a short description of the changes you made.
+  This will open an editor, give a short description (50 characters) and a list
+  of the changes (72 column format).
   \begin{itemize}
     \item Useful when you want to search.
   \end{itemize}
@@ -238,7 +239,7 @@
   \bigskip
 
   \begin{lstlisting}[language=none, caption=Difference between the working copy
-    and the last commit.]
+    and the staging area.]
     $ echo Third version. > README
     $ git diff
     --- a/README