test: remove xfail on SPARQL DESCRIBE test (#2309)

SPARQL DESCRIBE was implemented in
<#2221> so there should be no `xfail`
on it tests for it. This change removes one such `xfail` that was in place.

Author: aucampia

test/test_w3c_spec/test_sparql10_w3c.py

@@ -48,9 +48,6 @@
     f"{REMOTE_BASE_IRI}syntax-sparql1/manifest#syntax-lit-08": pytest.mark.skip(
         reason="bad test, positive syntax has invalid syntax."
     ),
-    f"{REMOTE_BASE_IRI}syntax-sparql2/manifest#syntax-form-describe01": pytest.mark.xfail(
-        reason="Describe not supported."
-    ),
     f"{REMOTE_BASE_IRI}syntax-sparql2/manifest#syntax-general-08": pytest.mark.xfail(
         reason="Not parsing with no spaces."
     ),