Expand documentation of refs_by_line().
Expand documentation of refs_by_line().

gartung/dxr,pelmers/dxr,jbradberry/dxr,kleintom/dxr,kleintom/dxr,gartung/dxr,pelmers/dxr,pombredanne/dxr,pombredanne/dxr,jay-z007/dxr,jay-z007/dxr,jbradberry/dxr,pelmers/dxr,kleintom/dxr,bozzmob/dxr,gartung/dxr,jbradberry/dxr,pelmers/dxr,bozzmob/dxr,pombredanne/dxr,pelmers/dxr,kleintom/dxr,pombredanne/dxr,gartung/dxr,bozzmob/dxr,gartung/dxr,bozzmob/dxr,kleintom/dxr,bozzmob/dxr,pelmers/dxr,pombredanne/dxr,kleintom/dxr,bozzmob/dxr,jbradberry/dxr,pombredanne/dxr,jay-z007/dxr,pelmers/dxr,jay-z007/dxr,jay-z007/dxr,jbradberry/dxr,pombredanne/dxr,jay-z007/dxr,kleintom/dxr,jay-z007/dxr,jbradberry/dxr,gartung/dxr,jbradberry/dxr,gartung/dxr,bozzmob/dxr