refactor: Rename variables and add needed comments

- https://git.selfprivacy.org/SelfPrivacy/selfprivacy.org.app/issues/265

lib/logic/providers/dns_providers/cloudflare.dart

@@ -133,10 +133,10 @@ class CloudflareDnsProvider extends DnsProvider {
 
     /// Remove all records that do not match with SelfPrivacy
     cloudflareRecords.removeWhere(
-      (final oceanRecord) => !selfprivacyRecords.any(
+      (final cloudflareRecord) => !selfprivacyRecords.any(
         (final selfprivacyRecord) =>
-            selfprivacyRecord.type == oceanRecord.type &&
-            selfprivacyRecord.name == oceanRecord.name,
+            selfprivacyRecord.type == cloudflareRecord.type &&
+            selfprivacyRecord.name == cloudflareRecord.name,
       ),
     );
 

lib/utils/network_utils.dart

@@ -122,6 +122,9 @@ List<DnsRecord> getProjectDnsRecords(
     ttl: 18000,
   );
 
+  /// We never create this record!
+  /// This declaration is only for removal
+  /// as we need to compare by 'type' and 'name'
   final DnsRecord txt3 = DnsRecord(
     type: 'TXT',
     name: 'selector._domainkey',