Merge pull request #4336 from NixOS/manpages

Documentation for nix subcommands

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+R""(
+
+# Examples
+
+* Apply the build environment of GNU hello to the current shell:
+
+  ```console
+  # . <(nix print-dev-env nixpkgs#hello)
+  ```
+
+# Description
+
+This command prints a shell script that can be sourced by `b`ash and
+that sets the environment variables and shell functions defined by the
+build process of *installable*. This allows you to get a similar build
+environment in your current shell rather than in a subshell (as with
+`nix develop`).
+
+)""