docs: use singular changelog/bundle S3 key prefixes (#179)

Match the docs-builder change that uploads changelog/bundle artifacts
under {product}/changelog/ and {product}/bundle/ instead of the plural
prefixes.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cotti

changelog/README.md

@@ -189,7 +189,7 @@ Each PR produces a file at `docs/changelog/{filename}.yaml` on the PR branch (wh
 
 ## Uploading to S3
 
-Changelog files on the default branch can be uploaded to S3. Files land in a **private bucket** (`elastic-docs-v3-changelog-bundles-private`), which is the internal source of truth. A scrubber Lambda automatically mirrors sanitized copies (with private repository references removed) to the **public bucket** served via CloudFront CDN. Changelogs are uploaded under `{product}/changelogs/{filename}.yaml`.
+Changelog files on the default branch can be uploaded to S3. Files land in a **private bucket** (`elastic-docs-v3-changelog-bundles-private`), which is the internal source of truth. A scrubber Lambda automatically mirrors sanitized copies (with private repository references removed) to the **public bucket** served via CloudFront CDN. Changelogs are uploaded under `{product}/changelog/{filename}.yaml`.
 
 ### 1. Add the upload workflow
 
@@ -431,7 +431,7 @@ If your changelog configuration is not at `docs/changelog.yml`, pass the path ex
 
 ### Output
 
-The primary workflow (`changelog-bundle.yml`) uploads the bundle to the `elastic-docs-v3-changelog-bundles` S3 bucket under `{product}/bundles/{filename}`. The bundle is available to downstream rendering workflows immediately after upload.
+The primary workflow (`changelog-bundle.yml`) uploads the bundle to the `elastic-docs-v3-changelog-bundles` S3 bucket under `{product}/bundle/{filename}`. The bundle is available to downstream rendering workflows immediately after upload.
 
 ### Bundle PR workflow (opt-in)
 

changelog/bundle-upload/README.md

@@ -26,4 +26,4 @@ steps:
       output: docs/releases/v9.2.0.yaml
 ```
 
-This action is typically used as the second job in the `changelog-bundle.yml` reusable workflow, after `bundle-create` generates the artifact. The S3 key for each bundle is `{product}/bundles/{filename}`, where the product is read from the bundle's YAML `products` array.
+This action is typically used as the second job in the `changelog-bundle.yml` reusable workflow, after `bundle-create` generates the artifact. The S3 key for each bundle is `{product}/bundle/{filename}`, where the product is read from the bundle's YAML `products` array.