update comments

Author: Mykola97

src/foam/core/referral/IdReferralCodeGenerationService.js

@@ -7,6 +7,7 @@
 foam.CLASS({
   package: 'foam.core.referral',
   name: 'IdReferralCodeGenerationService',
+  documentation: 'Default referral code generation service that uses referral code ID as the code',
 
   implements: [
     'foam.core.referral.ReferralCodeGeneratorService'

src/foam/core/referral/ReferralCode.js

@@ -76,7 +76,7 @@ foam.CLASS({
     {
       class: 'String',
       name: 'code',
-      documentation: 'actual referral code for the user'
+      documentation: 'Actual referral code for the user'
     },
     {
       // deprecated

src/foam/core/referral/rules.jrl

@@ -47,7 +47,7 @@ p({
   "id":"disable-old-referral-codes",
   "name": "Disable old referral codes",
   "priority": 100,
-  "documentation": "When new referral code is created mark old referral codes enabled = false",
+  "documentation": "When a new referral code is created, mark old referral codes as enabled = false",
   "ruleGroup": "Referrals",
   "daoKey": "referralCodeDAO",
   "operation": 0,