style(billing): make comments concise

app/javascript/dashboard/constants/billing.js

@@ -1,7 +1,4 @@
 // Single source of truth for billing currencies on the frontend.
-// Adding a currency = one entry in BILLING_CURRENCY_CONFIG, add the code to
-// SUPPORTED_BILLING_CURRENCIES, and add its label key under
-// BILLING_SETTINGS.CURRENCY.OPTIONS in the locale files.
 
 export const DEFAULT_BILLING_CURRENCY = 'usd';
 

app/javascript/dashboard/store/modules/accounts.js

@@ -147,8 +147,7 @@ export const actions = {
     commit(types.default.SET_ACCOUNT_UI_FLAG, { isSwitchingCurrency: true });
     try {
       await EnterpriseAccountAPI.switchCurrency(currency);
-      // Refresh the account so custom_attributes.billing_currency and the
-      // subscription details reflect the new currency.
+      // Refresh the account so billing_currency and subscription details reflect the switch.
       await dispatch('get', { silent: true });
     } catch (error) {
       throwErrorMessage(error);