Git fork

Merge branch 'fm/user-manual-use-preface'

Doc update to improve git.info

* fm/user-manual-use-preface:
user-manual.txt: assign preface an id and a title

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Documentation/user-manual.txt
··· 1 1 = Git User Manual 2 2 3 + [preface] 4 + == Introduction 5 + 3 6 Git is a fast distributed revision control system. 4 7 5 8 This manual is designed to be readable by someone with basic UNIX