Added a comment: printing keys first is the easiest workaround

diff --git a/doc/tips/finding_duplicate_files/comment_5_1a35ca360468bcb84a67ad8d62a2ef7d._comment b/doc/tips/finding_duplicate_files/comment_5_1a35ca360468bcb84a67ad8d62a2ef7d._comment
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+[[!comment format=mdwn
+ username="https://www.google.com/accounts/o8/id?id=AItOawkaBh9VNJ-RZ26wJZ4BEhMN1IlPT-DK6JA"
+ nickname="Alex"
+ subject="printing keys first is the easiest workaround"
+ date="2013-04-01T23:32:23Z"
+ content="""
+Since the keys are sure to have nos paces in them, putting them first makes working with the output with tools like sort, uniq, and awk simpler.
+"""]]