Documentation error in lsqr and lsmr

Small errors in ``` lsqr(A, b; kwrags...) -> x, [history] lsmr(A, b; kwrags...) -> x, [history] ``` Correct to ``` lsqr(A, b; kwargs...) -> x, [history] lsmr(A, b; kwargs...) -> x, [history] ```