modules are missing extra usage in the documentation

[amtoine]

Describe the bug

related to

• modules don't have "extra usage" but commands do nushell/nushell#11648
• add $.extra_usage to modules nushell/nushell#11649

How to reproduce

1. look at the source of nu-git-manager => it has a usage and extra usage
2. look at the documentation of the module => there is only the usage

Expected behavior

i expected to see the extra usage as well

Configuration

key	value
version	0.89.0
branch
commit_hash
build_os	linux-x86_64
build_target	x86_64-unknown-linux-gnu
rust_version	rustc 1.73.0 (cc66ad468 2023-10-03)
rust_channel	stable-x86_64-unknown-linux-gnu
cargo_version	cargo 1.73.0 (9c4383fb5 2023-08-26)
build_time	2024-01-11 18:20:14 +01:00
build_rust_channel	release
allocator	mimalloc
features	default, sqlite, trash, which, zip
installed_plugins	clipboard copy, clipboard paste, gstat, nu_plugin_explore

Additional context

No response

[amtoine]

this will only require to apply the following patch and regenerate the documentation when Nushell ships the fix

diff --git a/toolkit.nu b/toolkit.nu
index 8c82379..a34b0cb 100644
--- a/toolkit.nu
+++ b/toolkit.nu
@@ -325,6 +325,8 @@ def document-module [
             "## Description",
             $module.usage,
             "",
+            $module.extra_usage,
+            "",
             "## Commands",
             $commands,
         ]