blas,lapack: clean up docs and comments

Apply (with manual curation after the fact):
* s/^T/U+1d40/g
* s/^H/U+1d34/g
* s/, {2,3}if / $1/g

Some additional manual editing of odd formatting.

lapack/testlapack/dhseqr.go

@@ -188,7 +188,7 @@ func testDhseqr(t *testing.T, impl Dhseqrer, i int, test dhseqrTest, job lapack.
 		ztz := zeros(n, n, n)
 		blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, z, tz, 0, ztz)
 		if !equalApproxGeneral(ztz, hCopy, evTol) {
-			t.Errorf("%v: H != Z T Z^T", prefix)
+			t.Errorf("%v: H != Z T Zᵀ", prefix)
 		}
 	}