complex-numbers: reword explanation of `e^(a + bi)` (#1265)
complex-numbers: reword explanation of `e^(a + bi)` (#1265)


exercism/x-common,petertseng/x-common,ErikSchierboom/x-common,jmluy/x-common,exercism/x-common,rpottsoh/x-common,rpottsoh/x-common,jmluy/x-common,petertseng/x-common,ErikSchierboom/x-common,jmluy/x-common