added description of upsert and describe
added description of upsert and describe

pcon/jsforce,joeferraro/jsforce,parthiban019/jsforce,nutthawan/jsforce,saleswise/jsforce,lkatney/jsforce,jsforce/jsforce,polidog/jsforce,jdcrensh/jsforce,pcon/jsforce,jesperkristensen/jsforce,rdietrick/jsforce,jesperkristensen/jsforce,saleswise/jsforce,lkatney/jsforce,saleswise/jsforce,jsforce/jsforce,joeferraro/jsforce,kimchouard/jsforce,nutthawan/jsforce,jdcrensh/jsforce,jsforce/jsforce,parthiban019/jsforce,bhaskarmelkani/jsforce,bhaskarmelkani/jsforce,pcon/jsforce,stomita/node-salesforce