notes: document change in nix-shell behavior

doc/manual/rl-next/shebang-relative.md

@@ -0,0 +1,7 @@
+synopsis: ensure nix-shell shebang uses relative path
+prs: #5088
+description: {
+
+`nix-shell` shebangs use relative paths for files, but expressions were still evaluated using the current working directory. The new behavior is that evalutations are performed relative to the script.
+
+}

doc/manual/src/release-notes/rl-next.md

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+# Release X.Y (202?-??-??)
+
+- Fixed a bug where `nix-env --query` ignored `--drv-path` when `--json` was set.
+
+- Introduced the store [`mounted-ssh-ng://`](@docroot@/command-ref/new-cli/nix3-help-stores.md).
+  This store allows full access to a Nix store on a remote machine and additionally requires that the store be mounted in the local filesystem.
+
+- [`nix-shell`](../command-ref/nix-shell.md) shebangs now interpret "-E" with relative paths