docs: punctuate OCR navigation card

Signed-off-by: Lawrence Lane <llane@nvidia.com>

Author: lbliii

fern/versions/main/pages/curate-text/synthetic/index.mdx

@@ -126,7 +126,7 @@ tutorial
 </Card>
 
 <Card title="Nemotron OCR" href="/curate-text/synthetic/nemotron-ocr">
-Turn images into word-level OCR annotations and optionally generate verifier-scored multimodal QA conversations
+Turn images into word-level OCR annotations and optionally generate verifier-scored multimodal QA conversations.
 multimodal
 ocr
 visual-qa