common: Document that get_latest_commit() can return NULL

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It's possible for the "latest_commit" field of a FlatpakInstalledRef to
be NULL, which I think happens if the ref is no longer in the
remote.[1][2][3] So this commit documents the possibility of
flatpak_installed_ref_get_latest_commit() returning NULL.

[1] https://github.com/flatpak/flatpak/issues/309
[2] https://github.com/flatpak/flatpak/commit/6b4402b60
[3] https://github.com/flatpak/flatpak/commit/230e18db7

Closes: #2289
Approved by: matthiasclasen

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