internal/nettrace: fix spelling error

Change-Id: Ibf51c0687197c0d791916b21cba7f8408aa5300a
Reviewed-on: https://go-review.googlesource.com/c/go/+/383216
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Kevin Burke <kevin@burke.dev>

Author: kevinburke

src/internal/nettrace/nettrace.go

@@ -27,7 +27,7 @@ type Trace struct {
 	DNSStart func(name string)
 
 	// DNSDone is called after a DNS lookup completes (or fails).
-	// The coalesced parameter is whether singleflight de-dupped
+	// The coalesced parameter is whether singleflight de-duped
 	// the call. The addrs are of type net.IPAddr but can't
 	// actually be for circular dependency reasons.
 	DNSDone func(netIPs []any, coalesced bool, err error)