Add documentation to Traefik CRD properties

Co-authored-by: Romain <rtribotte@users.noreply.github.com>
Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>

pkg/redactor/testdata/anonymized-dynamic-config.json

@@ -283,6 +283,7 @@
             "notAfter": true,
             "notBefore": true,
             "sans": true,
+            "serialNumber": true,
             "subject": {
               "country": true,
               "province": true,
@@ -301,8 +302,7 @@
               "commonName": true,
               "serialNumber": true,
               "domainComponent": true
-            },
-            "serialNumber": true
+            }
           }
         },
         "retry": {

pkg/redactor/testdata/secured-dynamic-config.json

@@ -286,6 +286,7 @@
             "notAfter": true,
             "notBefore": true,
             "sans": true,
+            "serialNumber": true,
             "subject": {
               "country": true,
               "province": true,
@@ -304,8 +305,7 @@
               "commonName": true,
               "serialNumber": true,
               "domainComponent": true
-            },
-            "serialNumber": true
+            }
           }
         },
         "retry": {