sphinx_git: add 'repo-dir' in option_spec of GitCommitDetail #60
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Add 'repo-dir' option in the option_spec of GitCommitDetail class.
GitCommitDetail extends class GitDirectiveBase. GitDirectiveBase base class checks for 'repo-dir' option, with an environment default.
'repo-dir' option previously is in option_spec of GitChangelog but not of GitCommitDetail.
If 'repo-dir' option is added to the option_spec, that option becomes functional for GitCommitDetail because the option is queried in GitDirectiveBase.
1 use of 'repo-dir' option with GitCommitDetail is to embed the git revision (by commit SHA) of a neighboring git repository which is documented by the Sphinx documents, importing doxygen comments from that neighboring git repository by Breathe extension.