Add documentation for ld/pairwise endpoint
Add documentation for ld/pairwise endpoint

helensch/ensembl-rest,willmclaren/ensembl-rest,ens-lgil/ensembl-rest,willmclaren/ensembl-rest,ens-lgil/ensembl-rest,willmclaren/ensembl-rest,ens-lgil/ensembl-rest,helensch/ensembl-rest,ens-lgil/ensembl-rest,helensch/ensembl-rest,willmclaren/ensembl-rest,willmclaren/ensembl-rest,ens-lgil/ensembl-rest,helensch/ensembl-rest,helensch/ensembl-rest