Put back auto-generated comments for MTRBaseClusters. (#23846)

The changeset that added these initially was reverted, then when
re-landing this part of the change was removed to make review easier.

The changes are all comment-only.

src/darwin/Framework/CHIP/templates/MTRBaseClusters.zapt

@@ -14,7 +14,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 /**
  * Cluster {{name}}
- *    {{description}}
+ *
+ * {{description}}
  */
 {{#unless (isStrEqual (asUpperCamelCase name preserveAcronyms=true) (compatClusterNameRemapping name))}}
 MTR_NEWLY_AVAILABLE
@@ -26,6 +27,11 @@ MTR_NEWLY_AVAILABLE
                                    queue:(dispatch_queue_t)queue NS_DESIGNATED_INITIALIZER MTR_NEWLY_AVAILABLE;
 
 {{#chip_cluster_commands}}
+/**
+ * Command {{name}}
+ *
+ * {{description}}
+ */
 {{#*inline "cluster"}}{{asUpperCamelCase parent.name preserveAcronyms=true}}{{/inline~}}
 {{~#*inline "command"}}{{asUpperCamelCase name preserveAcronyms=true}}{{/inline~}}
 - (void){{asLowerCamelCase name}}WithParams:(MTR{{>cluster}}Cluster{{>command}}Params * {{#unless (commandHasRequiredField .)}}_Nullable{{/unless}})params completion:({{>command_completion_type command=.}})completion MTR_NEWLY_AVAILABLE;