Add olm.deprecations OperatorHub info

Author: adellape

modules/olm-deprecations-schema.adoc

@@ -7,6 +7,8 @@
 
 The optional `olm.deprecations` schema defines deprecation information for packages, bundles, and channels in a catalog. Operator authors can use this schema to provide relevant messages about their Operators, such as support status and recommended upgrade paths, to users running those Operators from a catalog.
 
+When this schema is defined, the {product-title} web console displays warning badges for the affected elements of the Operator, including any custom deprecation messages, on both the pre- and post-installation pages of the OperatorHub.
+
 An `olm.deprecations` schema entry contains one or more of the following `reference` types, which indicates the deprecation scope. After the Operator is installed, any specified messages can be viewed as status conditions on the related `Subscription` object.
 
 .Deprecation `reference` types