Remove markdown link references from v25.2.19 release notes

Removed PR link references from bullet points and link definitions
to simplify the release notes format.

Co-Authored-By: roachdev-claude <roachdev-claude-bot@cockroachlabs.com>

Author: mikeCRL

src/current/_includes/releases/v25.2/v25.2.19.md

@@ -6,15 +6,8 @@ Release Date: May 29, 2026
 
 <h3 id="v25-2-19-bug-fixes">Bug fixes</h3>
 
-- Fixed a bug where unqualified function calls could fail with incorrect privilege errors when two databases on the same cluster had identically-named functions in custom schemas. The query cache could serve a memo from one database context to another, causing `USAGE` privilege errors referencing schemas from the wrong database. [#169294][#169294]
-- Fixed a rare panic that could occur when a virtual cluster entry was removed before it was fully populated by the rangefeed. [#169415][#169415]
-- Fixed a possible `SIGSEGV` crash when a backup encountered a transient error writing to Azure Blob Storage. [#169702][#169702]
-- A long-running `BACKUP` to S3 using `AUTH=implicit` no longer fails with an `ExpiredToken` error when it races the rotation of the underlying short-lived credentials. The S3 client now retries `ExpiredToken`, `ExpiredTokenException`, and `RequestExpired` errors the same way the legacy `aws-sdk-go` v1 client did. [#169772][#169772]
-- Fixed a rare nil pointer panic in the internal SQL executor. [#169928][#169928]
-
-
-[#169928]: https://github.com/cockroachdb/cockroach/pull/169928
-[#169294]: https://github.com/cockroachdb/cockroach/pull/169294
-[#169415]: https://github.com/cockroachdb/cockroach/pull/169415
-[#169702]: https://github.com/cockroachdb/cockroach/pull/169702
-[#169772]: https://github.com/cockroachdb/cockroach/pull/169772
+- Fixed a bug where unqualified function calls could fail with incorrect privilege errors when two databases on the same cluster had identically-named functions in custom schemas. The query cache could serve a memo from one database context to another, causing `USAGE` privilege errors referencing schemas from the wrong database.
+- Fixed a rare panic that could occur when a virtual cluster entry was removed before it was fully populated by the rangefeed.
+- Fixed a possible `SIGSEGV` crash when a backup encountered a transient error writing to Azure Blob Storage.
+- A long-running `BACKUP` to S3 using `AUTH=implicit` no longer fails with an `ExpiredToken` error when it races the rotation of the underlying short-lived credentials. The S3 client now retries `ExpiredToken`, `ExpiredTokenException`, and `RequestExpired` errors the same way the legacy `aws-sdk-go` v1 client did.
+- Fixed a rare nil pointer panic in the internal SQL executor.