Add release notes entry

Add missing release notes entry, previously only contained a
reference to nvim-biscuits github.

docs/release-notes/rl-0.8.md

@@ -480,3 +480,6 @@
 [Cool-Game-Dev](https://github.com/Cool-Game-Dev):
 
 [nvim-biscuits]: https://github.com/code-biscuits/nvim-biscuits
+
+- Add [nvim-biscuits] to show block context. Available at
+  `vim.utility.nvim-biscuits`.

modules/plugins/utility/nvim-biscuits/config.nix

@@ -4,11 +4,17 @@
   ...
 }: let
   inherit (lib.modules) mkIf;
+  inherit (lib.nvim.dag) entryAnywhere;
+  inherit (lib.nvim.lua) toLuaObject;
   cfg = config.vim.utility.nvim-biscuits;
 in {
   config = mkIf cfg.enable {
     vim = {
       startPlugins = ["nvim-biscuits"];
+
+      pluginRC.nvim-biscuits = entryAnywhere ''
+        require('nvim-biscuits').setup(${toLuaObject cfg.setupOpts})
+      '';
     };
   };
 }