fix typo plus futher clarify

Author: schacon

book/07-git-tools/sections/reset.asc

@@ -252,7 +252,7 @@ And then simply run `git commit` again:
 
 image::images/reset-squash-r3.png[]
 
-Now you can see that your reachable history, the history you would push, now looks like you had one commit with `file-a.txt` v1, then a second that both modified `file-a.txt` to v2 and added `file-b.txt`.
+Now you can see that your reachable history, the history you would push, now looks like you had one commit with `file-a.txt` v1, then a second that both modified `file-a.txt` to v3 and added `file-b.txt`. The commit with the v2 version of the file is no longer in the history.
 
 
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