docs(geneva): mark bulk load columns as Beta (#217)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jmhsieh

docs/geneva/jobs/bulk-load-columns.mdx

@@ -5,7 +5,7 @@ description: Load or update column data from external sources (Parquet, Lance, I
 icon: columns-3
 ---
 
-<Badge>Introduced in Geneva 0.13.0</Badge>
+<Badge>Beta — introduced in Geneva 0.13.0</Badge>
 
 ## Overview