fix typo

Author: clairekinde11

src/content/docs/billing/manage-plans/about-plans.mdx

@@ -32,7 +32,7 @@ These are known limitations that we are actively working on to add.
 Plan groups are a collection of related plans, tied to either users or organizations. 
 
 - You can create as many plan groups as you need. 
-- Each group can only contain plans for user OR plans for orgs.
+- Each group can only contain plans for users OR plans for orgs.
 - You can create multiple pricing tables for one plan group (but only one is the default). 
 - Only one plan group can be included in a pricing table.