cmd/dist: fix tipo in comment

Change-Id: I98fbf0dc94cf182adec5d414a56b9cc5126c38f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/249437
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/cmd/dist/buildtool.go b/src/cmd/dist/buildtool.go
index 0b50f66..79eab24 100644
--- a/src/cmd/dist/buildtool.go
+++ b/src/cmd/dist/buildtool.go
@@ -113,7 +113,7 @@
 
 // File suffixes that use build tags introduced since Go 1.4.
 // These must not be copied into the bootstrap build directory.
-// Also igonore test files.
+// Also ignore test files.
 var ignoreSuffixes = []string{
 	"_arm64.s",
 	"_arm64.go",