When initializing submodules, a .gitmodules file in the top-level directory
of the containing repository is used to find the url of each submodule.
This file should be formatted in the same way as $GIR_DIR/config. The key
-to each submodule url is "submodule.$name.url".
+to each submodule url is "submodule.$name.url". See gitlink:gitmodules[5]
+for details.
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