Update genai_create_knowledge_base_data_source.yml (#1003)

Author: dbrian57

specification/resources/gen-ai/examples/curl/genai_create_knowledge_base_data_source.yml

@@ -1,6 +1,6 @@
 lang: cURL
 source: |-
-  curl -X DELETE \
+  curl -X POST \
     -H "Content-Type: application/json"  \
     -H "Authorization: Bearer $PREVIEW_API_TOKEN" \
     "https://api.digitalocean.com/v2/gen-ai/knowledge_bases/9a6e3975-b0c6-11ef-bf8f-4e013e2ddde4/data_sources/bd2a2db5-b8b0-11ef-bf8f-4e013e2ddde4"