all: fix more typos caused by unnecessary repetition

Updates #cleanup

Change-Id: I5c0b8f0152581231252ab97dd1820d8b3fcbe450
Signed-off-by: Alex Chan <alexc@tailscale.com>

wgengine/filter/match.go

@@ -56,7 +56,7 @@ func srcMatches(m *filtertype.Match, srcAddr netip.Addr, hasCap CapTestFunc) boo
 // CapTestFunc is the function signature of a function that tests whether srcIP
 // has a given capability.
 //
-// It it used in the fast path of evaluating filter rules so should be fast.
+// It is used in the fast path of evaluating filter rules so should be fast.
 type CapTestFunc = func(srcIP netip.Addr, cap tailcfg.NodeCapability) bool
 
 func (ms matches) matchIPsOnly(q *packet.Parsed, hasCap CapTestFunc) bool {

wgengine/filter/tailcfg.go

@@ -131,7 +131,7 @@ var (
 //
 // TODO(bradfitz): make this return an IPSet and plumb that all
 // around, and ultimately use a new version of IPSet.ContainsFunc like
-// Contains16Func that works in [16]byte address, so we we can match
+// Contains16Func that works in [16]byte address, so we can match
 // at runtime without allocating?
 func parseIPSet(arg string) (prefixes []netip.Prefix, peerCap tailcfg.NodeCapability, err error) {
 	if arg == "*" {

wgengine/magicsock/magicsock.go

@@ -2401,7 +2401,7 @@ func (c *Conn) handleDiscoMessage(msg []byte, src epAddr, shouldBeRelayHandshake
 		if isCached {
 			metricCachedPeerContactDERP.Add(1)
 		}
-		// If we did not already have an an endpoint for this peer, even a stale
+		// If we did not already have an endpoint for this peer, even a stale
 		// one, record how long it has been since the endpoint was initialized.
 		if !lastBest.ap.IsValid() {
 			c.logf("magicsock: new contact: peer=%s usec=%d cached=%v via=derp",

wgengine/magicsock/magicsock_test.go

@@ -579,7 +579,7 @@ func TestPickDERPFallback(t *testing.T) {
 		}
 	}
 
-	// Test that that the pointer value of c is blended in and
+	// Test that the pointer value of c is blended in and
 	// distribution over nodes works.
 	got := map[int]int{}
 	for range 50 {
@@ -1520,7 +1520,7 @@ func TestDiscoStringLogRace(t *testing.T) {
 	wg.Wait()
 }
 
-// Test32bitAlignment verifies that that the 64-bit atomic mono.Time fields are
+// Test32bitAlignment verifies that the 64-bit atomic mono.Time fields are
 // 64-bit aligned, so that StoreAtomic and LoadAtomic won't panic on 32-bit
 // platforms.
 //