firewall + firewalldb: fix typos

firewall/privacy_mapper.go

@@ -968,7 +968,7 @@ func ObfuscateConfig(db firewalldb.PrivacyMapReader, configB []byte) ([]byte,
 			_, err = strconv.ParseInt(value, 10, 64)
 			length := len(value)
 
-			// Channel ids can have different lenghts depending on
+			// Channel ids can have different lengths depending on
 			// the blockheight, 20 is equivalent to 10E9 blocks.
 			if err == nil && minChanIDLen <= length &&
 				length <= maxChanIDLen {

firewall/privacy_mapper_test.go

@@ -734,7 +734,7 @@ func TestObfuscateConfig(t *testing.T) {
 			name: "empty",
 		},
 		{
-			// We substitue pubkeys of different forms.
+			// We substitute pubkeys of different forms.
 			name: "several pubkeys",
 			config: []byte(`{"version":1,"list":` +
 				`["d23da57575cdcb878ac191e1e0c8a5c4f061b11cfdc7a8ec5c9d495270de66fdbf",` +

firewalldb/privacy_mapper.go

@@ -531,7 +531,7 @@ type PrivacyMapReader interface {
 
 // PrivacyMapPairs is an in memory implementation of the PrivacyMapReader.
 type PrivacyMapPairs struct {
-	// pairs is a map from real to psuedo strings.
+	// pairs is a map from real to pseudo strings.
 	pairs map[string]string
 
 	mu sync.Mutex