doc(prompts): Follow up on broken Prompt Sublink pages (#8530)

- Description: Follow up of #8478  
  - Issue: #8477
  - Dependencies: None
  - Tag maintainer: @baskaryan
  - Twitter handle: [@BharatR123](twitter.com/BharatR123)

The links were still broken after #8478 and sadly the issue was not
caught with either the Vercel app build and `make docs_linkcheck`

docs/docs_skeleton/vercel.json

@@ -3478,7 +3478,7 @@
     },
     {
       "source": "/en/latest/modules/prompts/example_selectors.html",
-      "destination": "/docs/modules/model_io/example_selectors"
+      "destination": "/docs/modules/model_io/prompts/example_selectors"
     },
     {
       "source": "/en/latest/modules/prompts/example_selectors/examples/custom_example_selector.html",
@@ -3494,7 +3494,7 @@
     },
     {
       "source": "/en/latest/modules/prompts/prompt_templates.html",
-      "destination": "/docs/modules/model_io/prompt_templates"
+      "destination": "/docs/modules/model_io/prompts/prompt_templates"
     },
     {
       "source": "/en/latest/modules/prompts/prompt_templates/examples/connecting_to_a_feature_store.html",