fix(docs): fixed command examples (#244)
fix(docs): fixed command examples (#244)

`--connection` parameter needs to be present for connection string otherwise default connection is made
calebmer/postgraphql,calebmer/postgraphql,calebmer/postgraphql,nbushak/postgraphql,postgraphql/postgraphql,nbushak/postgraphql,nbushak/postgraphql,calebmer/postgraphql,nbushak/postgraphql,postgraphql/postgraphql,postgraphql/postgraphql,postgraphql/postgraphql