doc: Add notes on s390x PCRE JIT

Signed-off-by: Evan Wies <evan@neomantra.net>

Author: neomantra

CHANGELOG.md

@@ -1,9 +1,11 @@
 Changelog
 =========
 
-## 1.27.1.2-3 (2025-07-29)
+## 1.27.1.2-3 (2025-07-30)
 
  * Update LuaRocks to `3.12.2` (#276)
+ * Enable PCRE JIT on `s390x` platform. (#208, #278, [upstream [#834](https://github.com/openresty/openresty/issues/834))
+   * This was possible with OpenResty `1.27`, as it adopted PCRE `10`. The prior PCRE `8` did not support JIT on `s390x`.
 
 ## 1.27.1.2-2 (2025-06-16)
 

README.md

@@ -111,7 +111,7 @@ The following "flavors" are built from source and are intended for more advanced
 
 The `openresty/openresty:latest` tag points to the latest `bookworm` image.
 
-Since `1.19.3.2-1`, all flavors support multi-architecture builds, both `amd64` and `aarch64`.  Since `1.21.4.1-1`, the `s390x` architecture is supported for build-from-source Ubuntu flavors (like `jammy`), however [PCRE JIT](https://github.com/zherczeg/sljit/issues/89) is disabled.
+Since `1.19.3.2-1`, all flavors support multi-architecture builds, both `amd64` and `aarch64`.  Since `1.21.4.1-1`, the `s390x` architecture is supported for build-from-source Ubuntu flavors (like `jammy`); prior to version `1.27.1.2-3`, [PCRE JIT](https://github.com/zherczeg/sljit/issues/89) is disabled for `s390x`.
 
 Starting with `1.13.6.1`, releases are tagged with `<openresty-version>-<image-version>-<flavor>`.  The latest `image-version` will also be tagged `<openresty-version>-<flavor>`.   The HEAD of the master branch is also labeled plainly as `<flavor>`.  The builds are managed by [Travis-CI](https://travis-ci.com/github/neomantra/docker-openresty) and [Appveyor](https://ci.appveyor.com/project/openresty/docker-openresty) (for Windows images).