docs: improve payment related guides (#12502)

* improve guide

* update guides

* small change

www/apps/resources/generated/slug-changes.mjs

@@ -4874,11 +4874,6 @@ export const slugChanges = [
     "newSlug": "/references/locking-module-provider",
     "filePath": "/www/apps/resources/references/locking/interfaces/locking.ILockingProvider/page.mdx"
   },
-  {
-    "origSlug": "/references/medusa_config/interfaces/medusa_config.ConfigModule",
-    "newSlug": "/references/medusa-config",
-    "filePath": "/www/apps/resources/references/medusa_config/interfaces/medusa_config.ConfigModule/page.mdx"
-  },
   {
     "origSlug": "/references/module_events/module_events.Auth",
     "newSlug": "/references/auth/events",
@@ -7064,11 +7059,6 @@ export const slugChanges = [
     "newSlug": "/references/sales-channel/models/SalesChannel",
     "filePath": "/www/apps/resources/references/sales_channel_models/variables/sales_channel_models.SalesChannel/page.mdx"
   },
-  {
-    "origSlug": "/references/search/classes/search.AbstractSearchService",
-    "newSlug": "/references/search-service",
-    "filePath": "/www/apps/resources/references/search/classes/search.AbstractSearchService/page.mdx"
-  },
   {
     "origSlug": "/references/stock_location_next/IStockLocationService/methods/stock_location_next.IStockLocationService.createStockLocations",
     "newSlug": "/references/stock-location-next/createStockLocations",