Docs: Clarify the non contextual post types (WordPress#58836)

Co-authored-by: youknowriad <[email protected]>
Co-authored-by: draganescu <[email protected]>

packages/editor/src/components/provider/index.js

@@ -28,6 +28,13 @@ const { ExperimentalBlockEditorProvider } = unlock( blockEditorPrivateApis );
 const { PatternsMenuItems } = unlock( editPatternsPrivateApis );
 
 const noop = () => {};
+
+/**
+ * These are global entities that are only there to split blocks into logical units
+ * They don't provide a "context" for the current post/page being rendered.
+ * So we should not use their ids as post context. This is important to allow post blocks
+ * (post content, post title) to be used within them without issues.
+ */
 const NON_CONTEXTUAL_POST_TYPES = [
 	'wp_block',
 	'wp_template',