nixos/rl-25.11: mention rEFInd, a boot manager for UEFI systems

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nixos/doc/manual/release-notes/rl-2511.section.md
··· 6 7 - `nixos-rebuild-ng`, a full rewrite of `nixos-rebuild` in Python, is enabled by default from this release. You can disable it by setting [](#opt-system.rebuild.enableNg) to `false` in your configuration if you need, but please report any issues. It is expected that the next major version of NixOS (26.05) will remove the {option}`system.rebuild.enableNg` option. 8 9 - Secure boot support can now be enabled for the Limine bootloader through {option}`boot.loader.limine.secureBoot.enable`. Bootloader install script signs the bootloader, then kernels are hashed during system rebuild and written to a config. This allows Limine to boot only the kernels installed through NixOS system. 10 11 - The default PostgreSQL version for new NixOS installations (i.e. with `system.stateVersion >= 25.11`) is v17.
··· 6 7 - `nixos-rebuild-ng`, a full rewrite of `nixos-rebuild` in Python, is enabled by default from this release. You can disable it by setting [](#opt-system.rebuild.enableNg) to `false` in your configuration if you need, but please report any issues. It is expected that the next major version of NixOS (26.05) will remove the {option}`system.rebuild.enableNg` option. 8 9 + - `rEFInd`, a graphical boot manager for UEFI systems, can now be used through [](#opt-boot.loader.refind.enable). 10 + 11 - Secure boot support can now be enabled for the Limine bootloader through {option}`boot.loader.limine.secureBoot.enable`. Bootloader install script signs the bootloader, then kernels are hashed during system rebuild and written to a config. This allows Limine to boot only the kernels installed through NixOS system. 12 13 - The default PostgreSQL version for new NixOS installations (i.e. with `system.stateVersion >= 25.11`) is v17.