Update git reset --hard note for clarity

Author: Kausar Mehmood

book/02-git-basics/sections/undoing.asc

@@ -79,7 +79,7 @@ The `CONTRIBUTING.md` file is modified but once again unstaged.
 
 [NOTE]
 =====
-While `git reset` _can_ be a dangerous command if you call it with `--hard`, in this instance the file in your working directory is not touched.
+While `git reset` _can_ be a dangerous command if you call it with `--hard` as it changes files in your working directory, however in the above example the file in your working directory is not touched.
 Calling `git reset` without an option is not dangerous - it only touches your staging area.
 =====