minor clarification to documentation
minor clarification to documentation

muffato/ensembl,at7/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,at7/ensembl,muffato/ensembl,willmclaren/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,danstaines/ensembl,willmclaren/ensembl,muffato/ensembl,Ensembl/ensembl,danstaines/ensembl,at7/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,Ensembl/ensembl,Ensembl/ensembl,mjg17/ensembl,mjg17/ensembl,at7/ensembl,james-monkeyshines/ensembl,muffato/ensembl