Re: [PATCH v3 2/6] Change 'git' to 'Git' whenever the whole system is referred to #1

In Documentation/git-rev-parse.txt, there is this bit:

 --resolve-git-dir <path>::
        Check if <path> is a valid git-dir or a git-file pointing to
        a valid git-dir. If <path> is a valid git-dir the resolved path to
        git-dir will be printed.

I think the author invented the word "git-dir" to mean what we ordinarily call $GIT_DIR (i.e. the directory that contains the repository data), and used "git-file" to mean what the code and error messages call "gitfile". I think it is better to leave these in lowercase, but we would need them in the glossary, probably after rewriting the latter to "gitfile". The former may want to be rewritten to "gitdir" or even "$GIT_DIR".