If there is a combination of `systemctl` commands where in one you are
enabling it and in another you are starting it, that can be done in one
single command with an additional flag called `--now`. This commit
changes those two command steps in docs to one command.
The help of systemctl shows the following explanation of `--now`:
```
Start or stop unit in addition to enabling or disabling it
```
Signed-off-by: Suraj Deshmukh <surajd.service@gmail.com>
Suraj Deshmukh
a0cf7ebf13