fix formatting on Catalyst Building Apps (#892)

Author: bc-andreadao

docs/integrations/apps/guide/catalyst-compatible-apps.mdx

@@ -1,7 +1,7 @@
 # Building Catalyst-compatible apps
 
 Before diving into information regarding Catalyst-compatible apps, it’s important to explicitly define some important terms:
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+
 ## Glossary
 
 - **App**: When we refer to an "app" in this guide, we are referring to a Single-Click Application which you can find listed in the BigCommerce app marketplace.