doc: Add a explanation of Git's data model #905
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1 error and 2 warnings
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                          check-style
                        
                      
                       Process completed with exit code 1. | 
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                          check-style
                        
                      
                        JGit wasn't installed, see above for clues why | 
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                          check-style
                        
                      
                        perforce wasn't installed, see above for clues why |