Add snippets to disable quantization in guide

qdrant-landing/content/documentation/headless/snippets/update-collection/disable-quantization/_description.md

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+This code snippet demonstrates disabling quantization for a collection.

qdrant-landing/content/documentation/headless/snippets/update-collection/disable-quantization/bash.md

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+```bash
+curl -X PATCH http://localhost:6333/collections/{collection_name} \
+  -H 'Content-Type: application/json' \
+  --data-raw '{
+    "quantization_config": "Disabled"
+  }'
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/disable-quantization/http.md

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+```http
+PATCH /collections/{collection_name}
+{
+    "quantization_config": "Disabled"
+}
+```