Make clarification and fix error in installation docs.
Make clarification and fix error in installation docs.

coreymbryant/libmesh,dschwen/libmesh,capitalaslash/libmesh,balborian/libmesh,90jrong/libmesh,vikramvgarg/libmesh,balborian/libmesh,pbauman/libmesh,90jrong/libmesh,giorgiobornia/libmesh,pbauman/libmesh,benkirk/libmesh,permcody/libmesh,dschwen/libmesh,permcody/libmesh,libMesh/libmesh,libMesh/libmesh,friedmud/libmesh,cahaynes/libmesh,dschwen/libmesh,90jrong/libmesh,aeslaughter/libmesh,90jrong/libmesh,jwpeterson/libmesh,svallaghe/libmesh,dmcdougall/libmesh,dknez/libmesh,libMesh/libmesh,aeslaughter/libmesh,hrittich/libmesh,friedmud/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,permcody/libmesh,svallaghe/libmesh,dknez/libmesh,svallaghe/libmesh,benkirk/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,hrittich/libmesh,BalticPinguin/libmesh,vikramvgarg/libmesh,balborian/libmesh,vikramvgarg/libmesh,permcody/libmesh,aeslaughter/libmesh,roystgnr/libmesh,libMesh/libmesh,dmcdougall/libmesh,jwpeterson/libmesh,90jrong/libmesh,roystgnr/libmesh,dschwen/libmesh,balborian/libmesh,benkirk/libmesh,hrittich/libmesh,giorgiobornia/libmesh,hrittich/libmesh,dmcdougall/libmesh,coreymbryant/libmesh,coreymbryant/libmesh,aeslaughter/libmesh,aeslaughter/libmesh,cahaynes/libmesh,giorgiobornia/libmesh,BalticPinguin/libmesh,aeslaughter/libmesh,dknez/libmesh,permcody/libmesh,dmcdougall/libmesh,hrittich/libmesh,giorgiobornia/libmesh,balborian/libmesh,friedmud/libmesh,cahaynes/libmesh,capitalaslash/libmesh,jiangwen84/libmesh,vikramvgarg/libmesh,jiangwen84/libmesh,giorgiobornia/libmesh,90jrong/libmesh,jiangwen84/libmesh,pbauman/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,aeslaughter/libmesh,permcody/libmesh,roystgnr/libmesh,vikramvgarg/libmesh,jiangwen84/libmesh,coreymbryant/libmesh,pbauman/libmesh,benkirk/libmesh,pbauman/libmesh,svallaghe/libmesh,coreymbryant/libmesh,giorgiobornia/libmesh,balborian/libmesh,pbauman/libmesh,dmcdougall/libmesh,vikramvgarg/libmesh,cahaynes/libmesh,friedmud/libmesh,BalticPinguin/libmesh,hrittich/libmesh,svallaghe/libmesh,dknez/libmesh,dschwen/libmesh,jiangwen84/libmesh,jwpeterson/libmesh,hrittich/libmesh,balborian/libmesh,dknez/libmesh,vikramvgarg/libmesh,aeslaughter/libmesh,balborian/libmesh,dknez/libmesh,permcody/libmesh,svallaghe/libmesh,svallaghe/libmesh,libMesh/libmesh,friedmud/libmesh,friedmud/libmesh,capitalaslash/libmesh,dschwen/libmesh,balborian/libmesh,cahaynes/libmesh,roystgnr/libmesh,jiangwen84/libmesh,friedmud/libmesh,permcody/libmesh,giorgiobornia/libmesh,dschwen/libmesh,jwpeterson/libmesh,jiangwen84/libmesh,benkirk/libmesh,aeslaughter/libmesh,roystgnr/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,vikramvgarg/libmesh,libMesh/libmesh,cahaynes/libmesh,dmcdougall/libmesh,dschwen/libmesh,capitalaslash/libmesh,benkirk/libmesh,balborian/libmesh,cahaynes/libmesh,dmcdougall/libmesh,hrittich/libmesh,cahaynes/libmesh,libMesh/libmesh,giorgiobornia/libmesh,roystgnr/libmesh,jiangwen84/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,90jrong/libmesh,benkirk/libmesh,libMesh/libmesh,friedmud/libmesh,jwpeterson/libmesh,benkirk/libmesh,dknez/libmesh,90jrong/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,pbauman/libmesh,dmcdougall/libmesh,benkirk/libmesh,hrittich/libmesh,capitalaslash/libmesh,pbauman/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,BalticPinguin/libmesh,dknez/libmesh,90jrong/libmesh,jwpeterson/libmesh,friedmud/libmesh,pbauman/libmesh,coreymbryant/libmesh,coreymbryant/libmesh