net/http: adjust wording on ServeMux godoc

When reading through the docs, I found that the sentence flows better with
the `to` present.

Change-Id: I51c21fa33c7a13748c0814dd87c76b9a8d64e2ec
GitHub-Last-Rev: 0642bd7
GitHub-Pull-Request: #63587
Reviewed-on: https://go-review.googlesource.com/c/go/+/535935
Reviewed-by: Damien Neil <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Roland Shoemaker <[email protected]>

Author: forfuncsake

src/net/http/server.go

@@ -2379,7 +2379,7 @@ func RedirectHandler(url string, code int) Handler {
 // There is one exception to this rule, for backwards compatibility:
 // if two patterns would otherwise conflict and one has a host while the other does not,
 // then the pattern with the host takes precedence.
-// If a pattern passed [ServeMux.Handle] or [ServeMux.HandleFunc] conflicts with
+// If a pattern passed to [ServeMux.Handle] or [ServeMux.HandleFunc] conflicts with
 // another pattern that is already registered, those functions panic.
 //
 // As an example of the general rule, "/images/thumbnails/" is more specific than "/images/",