Corrected reflog example

   The sentence wasn't consistent and
   was corrected.

Author: Kaartic Sivaraam

book/07-git-tools/sections/revision-selection.asc

@@ -131,7 +131,7 @@ d921970 HEAD@{1}: merge phedders/rdocs: Merge made by recursive.
 
 Every time your branch tip is updated for any reason, Git stores that information for you in this temporary history.
 And you can specify older commits with this data, as well.
-If you want to see the fifth prior value of the HEAD of your repository, you can use the `@{n}` reference that you see in the reflog output:
+If you want to see the fifth prior value of the HEAD of your repository, you can use the `@{5}` reference that you see in the reflog output:
 
 [source,console]
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