Minor change to introductory paragraph.

Change-Id: I172ded2b4a10f15236501f1cdc91b06f18f6e8cf

Documentation/intro-quick.txt

diff --git a/Documentation/intro-quick.txt b/Documentation/intro-quick.txt
index c6dad5b..a827bbd 100644
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 = Gerrit Code Review - A Quick Introduction
 
 Gerrit is a web-based code review tool built on top of the git version
-control system, but if you've got as far as reading this guide then
-you probably already know that. The purpose of this introduction is to
+control system. The purpose of this introduction is to
 allow you to answer the question, is Gerrit the right tool for me?
 Will it fit in my work flow and in my organization?