Update comments

spec/factories/pages_domains.rb

@@ -63,11 +63,9 @@ VM+d42lQAgoq318A84Xu5vRh1KCAJuztkhNbM+w=
     end
 
     trait :with_trusted_chain do
-      # This is
+      # This contains
       # [Intermediate #2 (SHA-2)] 'Comodo RSA Domain Validation Secure Server CA'
-      # [Intermediate #1 (SHA-2)] COMODO RSA Certification Authority
-      # We only validate that we want to rebuild the trust chain,
-      # we don't need end-to-end certificate to do that
+      # [Intermediate #1 (SHA-2)] 'COMODO RSA Certification Authority'
       certificate '-----BEGIN CERTIFICATE-----
 MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB
 hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G

spec/models/pages_domain_spec.rb

@@ -117,6 +117,10 @@ describe PagesDomain, models: true do
     end
 
     context 'for trusted certificate chain' do
+      # We only validate that we can to rebuild the trust chain, for certificates
+      # We assume that 'AddTrustExternalCARoot' needed to validate the chain is in trusted store.
+      # It will be if ca-certificates is installed on Debian/Ubuntu/Alpine
+
       let(:domain) { build(:pages_domain, :with_trusted_chain) }
 
       it { is_expected.to be_truthy }