doc: document isl_space_can_{,un}curry
doc: document isl_space_can_{,un}curry

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

BenzoSM/isl,inducer/isl-mirror,BenzoSM/isl,nicolasvasilache/isl,Distrotech/isl,inducer/isl-mirror,inducer/isl-mirror,PollyLabs/isl,PollyLabs/isl,BenzoSM/isl,BenzoSM/isl,Meinersbur/isl,Distrotech/isl,tobig/isl,nicolasvasilache/isl,tobig/isl,PollyLabs/isl,BenzoSM/isl,Distrotech/isl,Distrotech/isl,Distrotech/isl,UBERTC/isl,UBERTC/isl,UBERTC/isl,inducer/isl-mirror,nicolasvasilache/isl,nicolasvasilache/isl,tobig/isl,PollyLabs/isl,Meinersbur/isl,nicolasvasilache/isl,UBERTC/isl,Meinersbur/isl,tobig/isl,Meinersbur/isl,inducer/isl-mirror,PollyLabs/isl