techdocs: rename entity-content empty state extension

Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>

.changeset/tall-taxis-flow.md

@@ -2,4 +2,4 @@
 '@backstage/plugin-techdocs': patch
 ---
 
-Add `element:techdocs/entity-content-empty-state` extension to allow overriding the empty state for the entity page techdocs tab.
+Add `empty-state:techdocs/entity-content` extension to allow overriding the empty state for the entity page techdocs tab.

plugins/techdocs/api-report-alpha.md

@@ -224,7 +224,7 @@ const _default: FrontendPlugin<
       namespace: undefined;
       name: undefined;
     }>;
-    'element:techdocs/entity-content-empty-state': ExtensionDefinition<{
+    'empty-state:techdocs/entity-content': ExtensionDefinition<{
       config: {};
       configInput: {};
       output: ConfigurableExtensionDataRef<
@@ -241,9 +241,9 @@ const _default: FrontendPlugin<
           }
         >;
       };
-      kind: 'element';
+      kind: 'empty-state';
       namespace: undefined;
-      name: 'entity-content-empty-state';
+      name: 'entity-content';
     }>;
   }
 >;

plugins/techdocs/src/alpha.tsx

@@ -186,8 +186,8 @@ const techDocsEntityContent = EntityContentBlueprint.makeWithOverrides({
 });
 
 const TechDocsEntityContentEmptyState = createExtension({
-  kind: 'element',
-  name: 'entity-content-empty-state',
+  kind: 'empty-state',
+  name: 'entity-content',
   attachTo: { id: 'entity-content:techdocs', input: 'emptyState' },
   output: [coreExtensionData.reactElement],
   factory: () => [