os: fix a typo in path_windows.go

I believe the path_windows.go file has a typo, which is fixed in this PR

Change-Id: Ibf1a7189a6312dbb3b1e6b512beeb6d99da5b5bc
GitHub-Last-Rev: cedac7eaa07d26667e6800c5ac96239d5ccf6ba8
GitHub-Pull-Request: golang/go#53629
Reviewed-on: https://go-review.googlesource.com/c/go/+/415434
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
diff --git a/src/os/path_windows.go b/src/os/path_windows.go
index a96245f..3356908 100644
--- a/src/os/path_windows.go
+++ b/src/os/path_windows.go
@@ -11,7 +11,7 @@
 
 // IsPathSeparator reports whether c is a directory separator character.
 func IsPathSeparator(c uint8) bool {
-	// NOTE: Windows accept / as path separator.
+	// NOTE: Windows accepts / as path separator.
 	return c == '\\' || c == '/'
 }