Fixed the description for human_donor age to be human specific and not model organism specific.
Fixed the description for human_donor age to be human specific and not model organism specific.

ENCODE-DCC/snovault,ENCODE-DCC/snovault,T2DREAM/t2dream-portal,philiptzou/clincoded,ClinGen/clincoded,hms-dbmi/fourfront,kidaa/encoded,ENCODE-DCC/encoded,ClinGen/clincoded,ENCODE-DCC/encoded,kidaa/encoded,4dn-dcic/fourfront,T2DREAM/t2dream-portal,4dn-dcic/fourfront,philiptzou/clincoded,hms-dbmi/fourfront,ENCODE-DCC/encoded,kidaa/encoded,ClinGen/clincoded,hms-dbmi/fourfront,ENCODE-DCC/snovault,T2DREAM/t2dream-portal,kidaa/encoded,ClinGen/clincoded,philiptzou/clincoded,ENCODE-DCC/snovault,hms-dbmi/fourfront,philiptzou/clincoded,T2DREAM/t2dream-portal,ENCODE-DCC/encoded,4dn-dcic/fourfront,kidaa/encoded,philiptzou/clincoded,hms-dbmi/fourfront,ENCODE-DCC/snovault,4dn-dcic/fourfront,ClinGen/clincoded