native: mark internal routines

These (generally) cannot be made unexported because we test via
testlapack.

Also fix a name and some capitalisation.

native/dorglq.go

@@ -17,12 +17,14 @@ import (
 //
 // len(tau) >= k, 0 <= k <= n, and 0 <= n <= m.
 //
-// Work is temporary storage, and lwork specifies the usable memory length. At minimum,
+// work is temporary storage, and lwork specifies the usable memory length. At minimum,
 // lwork >= m, and the amount of blocking is limited by the usable length.
 // If lwork == -1, instead of computing Dorglq the optimal work length is stored
 // into work[0].
 //
 // Dorglq will panic if the conditions on input values are not met.
+//
+// Dorglq is an internal routine. It is exported for testing purposes.
 func (impl Implementation) Dorglq(m, n, k int, a []float64, lda int, tau, work []float64, lwork int) {
 	nb := impl.Ilaenv(1, "DORGLQ", " ", m, n, k, -1)
 	// work is treated as an n×nb matrix