Merge pull request rails#50819 from tanaken0515/patch-1

[ci skip] docs: fix `Entry#entryable_types` to `Entry.entryable_types`

Author: p8

guides/source/association_basics.md

@@ -3007,7 +3007,7 @@ With this definition complete, our `Entry` delegator now provides the following
 
 | Method | Return |
 |---|---|
-| `Entry#entryable_types` | ["Message", "Comment"] |
+| `Entry.entryable_types` | ["Message", "Comment"] |
 | `Entry#entryable_class` | Message or Comment |
 | `Entry#entryable_name` | "message" or "comment" |
 | `Entry.messages` | `Entry.where(entryable_type: "Message")` |