Update loading.rst
Update loading.rst

VEP file structure was confusing. I change it in the format that GEMINI accepts it.
heuermh/gemini,bgruening/gemini,arq5x/gemini,arq5x/gemini,bpow/gemini,heuermh/gemini,bgruening/gemini,udp3f/gemini,bpow/gemini,bgruening/gemini,bgruening/gemini,xuzetan/gemini,brentp/gemini,xuzetan/gemini,brentp/gemini,xuzetan/gemini,udp3f/gemini,bw2/gemini,bpow/gemini,brentp/gemini,arq5x/gemini,brentp/gemini,heuermh/gemini,arq5x/gemini,udp3f/gemini,heuermh/gemini,udp3f/gemini,bw2/gemini,xuzetan/gemini,bw2/gemini,bw2/gemini,bpow/gemini