[PR PATCH] Manual.md: recommend keeping systemd units

[CameronNemo <CameronNemo@users.noreply.github.com>]

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There is a new pull request by CameronNemo against master on the void-packages repository

https://github.com/CameronNemo/void-packages systemd
https://github.com/void-linux/void-packages/pull/37395

Manual.md: recommend keeping systemd units
Closes #32481

[ci skip]

#### Testing the changes
- I tested the changes in this PR: **N/A**


A patch file from https://github.com/void-linux/void-packages/pull/37395.patch is attached

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From a4aec302583d13bd96bc72bd71ad85e905f40276 Mon Sep 17 00:00:00 2001
From: Cameron Nemo <cnemo@tutanota.com>
Date: Thu, 2 Jun 2022 11:58:53 -0700
Subject: [PATCH] Manual.md: recommend keeping systemd units

Closes #32481
---
 Manual.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Manual.md b/Manual.md
index 8afe781f0ec1..33eb02735c3f 100644
--- a/Manual.md
+++ b/Manual.md
@@ -1410,6 +1410,9 @@ If the service requires directories in parts of the system that are not generall
 temporary filesystems. Then use the `make_dirs` variable in the template to create
 those directories when the package is installed.
 
+If the package installs a systemd service file or other unit, leave it in place as a
+reference point so long as including it has no negative side effects.
+
 <a id="32bit_pkgs"></a>
 ### 32bit packages