all: fix spelling mistakes

Signed-off-by: nicksherron <nsherron90@gmail.com>

control/controlclient/direct.go

@@ -79,7 +79,7 @@ type Direct struct {
 	endpoints     []tailcfg.Endpoint
 	everEndpoints bool   // whether we've ever had non-empty endpoints
 	localPort     uint16 // or zero to mean auto
-	lastPingURL   string // last PingRequest.URL received, for dup suppresion
+	lastPingURL   string // last PingRequest.URL received, for dup suppression
 }
 
 type Options struct {

control/controlclient/map_test.go

@@ -218,7 +218,7 @@ func TestNetmapForResponse(t *testing.T) {
 		}
 		nm2 := ms.netmapForResponse(&tailcfg.MapResponse{
 			Node:      new(tailcfg.Node),
-			DNSConfig: nil, // implict
+			DNSConfig: nil, // implicit
 		})
 		if !reflect.DeepEqual(nm2.DNS, *someDNSConfig) {
 			t.Fatalf("2nd DNS wrong")