docs/sphinx: fix compatibility with sphinx < 1.8
SphinxDirective was added with sphinx 1.8 (2018-09-13). Reported-by:Thomas Huth <thuth@redhat.com> Signed-off-by:
Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by:
Thomas Huth <thuth@redhat.com> Message-Id: <20220104074649.1712440-1-marcandre.lureau@redhat.com> Signed-off-by:
Thomas Huth <thuth@redhat.com>
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