cmd/link: fix typo in asm.go

targetting -> targeting

Change-Id: Ie1752b1293426fe908799731acb352408db98d85
GitHub-Last-Rev: 4cf2a21
GitHub-Pull-Request: #43564
Reviewed-on: https://go-review.googlesource.com/c/go/+/282272
Trust: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/link/internal/arm64/asm.go

@@ -1041,7 +1041,7 @@ func gensymlate(ctxt *ld.Link, ldr *loader.Loader) {
 }
 
 // machoLabelName returns the name of the "label" symbol used for a
-// relocation targetting s+off. The label symbols is used on darwin
+// relocation targeting s+off. The label symbols is used on darwin
 // when external linking, so that the addend fits in a Mach-O relocation.
 func machoLabelName(ldr *loader.Loader, s loader.Sym, off int64) string {
 	return fmt.Sprintf("%s.%d", ldr.SymExtname(s), off/machoRelocLimit)