doc: remove useless rec

doc/languages-frameworks/emscripten.section.md

@@ -41,7 +41,7 @@ One advantage is that when `pkgs.zlib` is updated, it will automatically update
 (pkgs.zlib.override {
   stdenv = pkgs.emscriptenStdenv;
 }).overrideAttrs
-  (old: rec {
+  (old: {
     buildInputs = old.buildInputs ++ [ pkg-config ];
     # we need to reset this setting!
     env = (old.env or { }) // {
@@ -119,8 +119,9 @@ One advantage is that when `pkgs.zlib` is updated, it will automatically update
 This `xmlmirror` example features an Emscripten package that is defined completely from this context and no `pkgs.zlib.override` is used.
 
 ```nix
-pkgs.buildEmscriptenPackage rec {
-  name = "xmlmirror";
+pkgs.buildEmscriptenPackage {
+  pname = "xmlmirror";
+  version = "1.2.3";
 
   buildInputs = [
     pkg-config

doc/packages/emacs.section.md

@@ -28,9 +28,8 @@ You can install it like any other packages via `nix-env -iA myEmacs`. However, t
 
 ```nix
 {
-  packageOverrides =
-    pkgs: with pkgs; rec {
-      myEmacsConfig = writeText "default.el" ''
+  packageOverrides = pkgs: {
+    myEmacsConfig = pkgs.writeText "default.el" ''
       (eval-when-compile
         (require 'use-package))
 

doc/using/configuration.chapter.md

@@ -300,15 +300,14 @@ This provides us with some useful documentation for using our packages.  However
 
 ```nix
 {
-  packageOverrides =
-    pkgs: with pkgs; rec {
-      myProfile = writeText "my-profile" ''
+  packageOverrides = pkgs: {
+    myProfile = pkgs.writeText "my-profile" ''
       export PATH=$HOME/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/sbin:/bin:/usr/sbin:/usr/bin
       export MANPATH=$HOME/.nix-profile/share/man:/nix/var/nix/profiles/default/share/man:/usr/share/man
     '';
     myPackages = pkgs.buildEnv {
       name = "my-packages";
-        paths = [
+      paths = with pkgs; [
         (runCommand "profile" { } ''
           mkdir -p $out/etc/profile.d
           cp ${myProfile} $out/etc/profile.d/my-profile.sh
@@ -360,16 +359,15 @@ Configuring GNU info is a little bit trickier than man pages. To work correctly,
 
 ```nix
 {
-  packageOverrides =
-    pkgs: with pkgs; rec {
-      myProfile = writeText "my-profile" ''
+  packageOverrides = pkgs: {
+    myProfile = pkgs.writeText "my-profile" ''
       export PATH=$HOME/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/sbin:/bin:/usr/sbin:/usr/bin
       export MANPATH=$HOME/.nix-profile/share/man:/nix/var/nix/profiles/default/share/man:/usr/share/man
       export INFOPATH=$HOME/.nix-profile/share/info:/nix/var/nix/profiles/default/share/info:/usr/share/info
     '';
     myPackages = pkgs.buildEnv {
       name = "my-packages";
-        paths = [
+      paths = with pkgs; [
         (runCommand "profile" { } ''
           mkdir -p $out/etc/profile.d
           cp ${myProfile} $out/etc/profile.d/my-profile.sh