docs(web/guides): note paginationLinks() runtime warning and upgrade-check coverage

Signed-off-by: wheels-bot[bot] <wheels-bot[bot]@users.noreply.github.com>
Signed-off-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>

Author: github-actions[bot]

web/sites/guides/src/content/docs/v4-0-0/upgrading/3x-to-4x.mdx

@@ -321,7 +321,7 @@ See [Packages](/v4-0-0/digging-deeper/packages/) for manifest fields, per-method
 
 ### Monolithic `paginationLinks()`
 
-**CHANGELOG:** composable pagination helpers added (#1930). The 3.x `paginationLinks()` is retained. New code should use `paginationNav()` or compose the individual helpers (`paginationInfo`, `firstPageLink`, `previousPageLink`, `pageNumberLinks`, `nextPageLink`, `lastPageLink`).
+**CHANGELOG:** composable pagination helpers added (#1930). The 3.x `paginationLinks()` is retained but deprecated. As of #2727, calling `paginationLinks()` emits a one-time per-request `WriteLog(type="warning")` pointing at the replacement so apps see the signal without flooding the log. `wheels upgrade check --to=4.0.0` also greps `app/views/` for `paginationLinks(` and flags every hit with a remediation pointer. New code should use `paginationNav()` or compose the individual helpers (`paginationInfo`, `firstPageLink`, `previousPageLink`, `pageNumberLinks`, `nextPageLink`, `lastPageLink`).
 
 ### RocketUnit test style
 

web/sites/guides/src/content/docs/v4-0-1-snapshot/upgrading/3x-to-4x.mdx

@@ -321,7 +321,7 @@ See [Packages](/v4-0-1-snapshot/digging-deeper/packages/) for manifest fields, p
 
 ### Monolithic `paginationLinks()`
 
-**CHANGELOG:** composable pagination helpers added (#1930). The 3.x `paginationLinks()` is retained. New code should use `paginationNav()` or compose the individual helpers (`paginationInfo`, `firstPageLink`, `previousPageLink`, `pageNumberLinks`, `nextPageLink`, `lastPageLink`).
+**CHANGELOG:** composable pagination helpers added (#1930). The 3.x `paginationLinks()` is retained but deprecated. As of #2727, calling `paginationLinks()` emits a one-time per-request `WriteLog(type="warning")` pointing at the replacement so apps see the signal without flooding the log. `wheels upgrade check --to=4.0.0` also greps `app/views/` for `paginationLinks(` and flags every hit with a remediation pointer. New code should use `paginationNav()` or compose the individual helpers (`paginationInfo`, `firstPageLink`, `previousPageLink`, `pageNumberLinks`, `nextPageLink`, `lastPageLink`).
 
 ### RocketUnit test style