Improve docs about register/run as a service (#27461)

As title

docs/content/installation/run-as-service-in-ubuntu.en-us.md

@@ -1,6 +1,6 @@
 ---
 date: "2017-07-21T12:00:00+02:00"
-title: "Run as service in Linux"
+title: "Run as a Linux service"
 slug: "linux-service"
 sidebar_position: 40
 toc: false
@@ -15,11 +15,11 @@ menu:
     identifier: "linux-service"
 ---
 
-### Run Gitea as Linux service
+# Run as a Linux service
 
-You can run Gitea as service, using either systemd or supervisor. The steps below tested on Ubuntu 16.04, but those should work on any Linux distributions (with little modification).
+You can run Gitea as a Linux service, using either systemd or supervisor. The steps below tested on Ubuntu 16.04, but those should work on any Linux distributions (with little modification).
 
-#### Using systemd
+## Using systemd
 
 Copy the sample [gitea.service](https://github.com/go-gitea/gitea/blob/main/contrib/systemd/gitea.service) to `/etc/systemd/system/gitea.service`, then edit the file with your favorite editor.
 
@@ -41,7 +41,7 @@ If you have systemd version 220 or later, you can enable and immediately start G
 sudo systemctl enable gitea --now
 ```
 
-#### Using supervisor
+## Using supervisor
 
 Install supervisor by running below command in terminal:
 

docs/content/installation/windows-service.en-us.md

@@ -1,6 +1,6 @@
 ---
 date: "2016-12-21T15:00:00-02:00"
-title: "Register as a Windows Service"
+title: "Register as a Windows service"
 slug: "windows-service"
 sidebar_position: 50
 toc: false
@@ -14,8 +14,9 @@ menu:
     sidebar_position: 50
     identifier: "windows-service"
 ---
+# Register as a Windows service
 
-# Prerequisites
+## Prerequisites
 
 The following changes are made in C:\gitea\custom\conf\app.ini:
 
@@ -27,7 +28,7 @@ Sets Gitea to run as the local system user.
 
 COMPUTERNAME is whatever the response is from `echo %COMPUTERNAME%` on the command line. If the response is `USER-PC` then `RUN_USER = USER-PC$`
 
-## Use absolute paths
+### Use absolute paths
 
 If you use SQLite3, change the `PATH` to include the full path:
 
@@ -36,7 +37,7 @@ If you use SQLite3, change the `PATH` to include the full path:
 PATH     = c:/gitea/data/gitea.db
 ```
 
-# Register as a Windows Service
+## Register Gitea
 
 To register Gitea as a Windows service, open a command prompt (cmd) as an Administrator,
 then run the following command:
@@ -51,7 +52,7 @@ Open "Windows Services", search for the service named "gitea", right-click it an
 "Run". If everything is OK, Gitea will be reachable on `http://localhost:3000` (or the port
 that was configured).
 
-## Service startup type
+### Service startup type
 
 It was observed that on loaded systems during boot Gitea service may fail to start with timeout records in Windows Event Log.
 In that case change startup type to `Automatic-Delayed`. This can be done during service creation, or by running config command
@@ -60,7 +61,7 @@ In that case change startup type to `Automatic-Delayed`. This can be done during
 sc.exe config gitea start= delayed-auto
 ```
 
-## Adding startup dependencies
+### Adding startup dependencies
 
 To add a startup dependency to the Gitea Windows service (eg Mysql, Mariadb), as an Administrator, then run the following command:
 
@@ -70,9 +71,9 @@ sc.exe config gitea depend= mariadb
 
 This will ensure that when the Windows machine restarts, the automatic starting of Gitea is postponed until the database is ready and thus mitigate failed startups.
 
-## Unregister as a service
+## Unregister Gitea
 
-To unregister Gitea as a service, open a command prompt (cmd) as an Administrator and run:
+To unregister Gitea as a Windows service, open a command prompt (cmd) as an Administrator and run:
 
 ```
 sc.exe delete gitea