all: use one 'l' when cancelling everywhere except Solaris

Fixes #11626.

Change-Id: I1b70c0844473c3b57a53d7cca747ea5cdc68d232
Reviewed-on: https://go-review.googlesource.com/14526
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/src/math/j1.go b/src/math/j1.go
index 7ac186b..c537a72 100644
--- a/src/math/j1.go
+++ b/src/math/j1.go
@@ -39,7 +39,7 @@
 //                      =  1/sqrt(2) * (sin(x) - cos(x))
 //              sin(x1) =  sin(x)cos(3pi/4)-cos(x)sin(3pi/4)
 //                      = -1/sqrt(2) * (sin(x) + cos(x))
-//         (To avoid cancellation, use
+//         (To avoid cancelation, use
 //              sin(x) +- cos(x) = -cos(2x)/(sin(x) -+ cos(x))
 //         to compute the worse one.)
 //
@@ -197,7 +197,7 @@
 		//                 =  1/sqrt(2) * (sin(x) - cos(x))
 		//         sin(x0) = sin(x)cos(3pi/4)-cos(x)sin(3pi/4)
 		//                 = -1/sqrt(2) * (cos(x) + sin(x))
-		// To avoid cancellation, use
+		// To avoid cancelation, use
 		//     sin(x) +- cos(x) = -cos(2x)/(sin(x) -+ cos(x))
 		// to compute the worse one.