Fix ReferenceFieldBase documentation.

Co-authored-by: Jean-Baptiste Kaiser <[email protected]>

Author: Madeorsk

docs/ReferenceFieldBase.md

@@ -275,9 +275,9 @@ For example, the following code prefetches the authors referenced by the posts:
 const PostShow = () => (
     <ShowBase
         queryOptions={{ meta: { prefetch: ['author'] } }}
-        render={author => (
+        render={post => (
             <div>
-                <h3>{author.title}</h3>
+                <h3>{post.title}</h3>
                 <ReferenceFieldBase source="author_id" reference="authors">
                     <AuthorView />
                 </ReferenceFieldBase>

docs_headless/src/content/docs/ReferenceFieldBase.md

@@ -267,9 +267,9 @@ For example, the following code prefetches the authors referenced by the posts:
 const PostShow = () => (
     <ShowBase
         queryOptions={{ meta: { prefetch: ['author'] } }}
-        render={author => (
+        render={post => (
             <div>
-                <h3>{author.title}</h3>
+                <h3>{post.title}</h3>
                 <ReferenceFieldBase source="author_id" reference="authors">
                     <AuthorView />
                 </ReferenceFieldBase>