docs: update beets and description of overriding packages

The beets package no longer has the "enableCheck" option so this was
confusing. Also the word override was used to mean two different
things so I modified the FAQ to use the word "change" and linked to
documentation regarding package overrides.

docs/manual/faq.md

@@ -6,5 +6,5 @@ faq/session-variables.md
 faq/multiple-users-machines.md
 faq/ca-desrt-dconf.md
 faq/unstable.md
-faq/override-package-module.md
+faq/change-package-module.md
 ```

docs/manual/faq/change-package-module.md

@@ -1,4 +1,4 @@
-# How do I override the package used by a module? {#_how_do_i_override_the_package_used_by_a_module}
+# How do I change the package used by a module? {#_how_do_i_change_the_package_used_by_a_module}
 
 By default Home Manager will install the package provided by your chosen
 `nixpkgs` channel but occasionally you might end up needing to change
@@ -6,13 +6,35 @@ this package. This can typically be done in two ways.
 
 1.  If the module provides a `package` option, such as
     `programs.beets.package`, then this is the recommended way to
-    perform the override. For example,
+    perform the change. For example,
 
     ``` nix
-    programs.beets.package = pkgs.beets.override { enableCheck = true; };
+    programs.beets.package = pkgs.beets.override { pluginOverrides = { beatport.enable = false; }; };
     ```
 
-2.  If no `package` option is available then you can typically override
+    See [Nix pill 17](https://nixos.org/guides/nix-pills/nixpkgs-overriding-packages.html)
+    for more information on package overrides. Alternatively, if you want
+    to use the `beets` package from Nixpkgs unstable, then a configuration like
+
+    ``` nix
+    { pkgs, config, ... }:
+
+    let
+
+      pkgsUnstable = import <nixpkgs-unstable> {};
+
+    in
+
+    {
+      programs.beets.package = pkgsUnstable.beets;
+
+      # …
+    }
+    ```
+
+    should work OK.
+
+3.  If no `package` option is available then you can typically change
     the relevant package using an
     [overlay](https://nixos.org/nixpkgs/manual/#chap-overlays).
 

modules/programs/beets.nix

@@ -32,8 +32,8 @@ in {
         type = types.package;
         default = pkgs.beets;
         defaultText = literalExpression "pkgs.beets";
-        example =
+        example = literalExpression
-          literalExpression "(pkgs.beets.override { enableCheck = true; })";
+          "(pkgs.beets.override { pluginOverrides = { beatport.enable = false; }; })";
         description = ''
           The `beets` package to use.
           Can be used to specify extensions.