docs: socketfilterfw needs sudo

It is reported that the following commands fix the issue 1259:
```
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --add /usr/libexec/bootpd
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --unblock /usr/libexec/bootpd
```

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

website/content/en/docs/Config/Network/_index.md

@@ -168,8 +168,8 @@ and will stop automatically once the last instance has stopped. Daemon logs will
 The IP address is automatically assigned by macOS's bootpd.
 If the IP address is not assigned, try the following commands:
 ```bash
-/usr/libexec/ApplicationFirewall/socketfilterfw --add /usr/libexec/bootpd
-/usr/libexec/ApplicationFirewall/socketfilterfw --unblock /usr/libexec/bootpd
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --add /usr/libexec/bootpd
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --unblock /usr/libexec/bootpd
 ```
 
 #### Unmanaged

website/content/en/docs/faq/_index.md

@@ -181,8 +181,8 @@ For more details, see [Documentation/Networking](https://wiki.qemu.org/Documenta
 #### "IP address is not assigined for vmnet networks"
 Try the following commands:
 ```bash
-/usr/libexec/ApplicationFirewall/socketfilterfw --add /usr/libexec/bootpd
-/usr/libexec/ApplicationFirewall/socketfilterfw --unblock /usr/libexec/bootpd
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --add /usr/libexec/bootpd
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --unblock /usr/libexec/bootpd
 ```
 
 ### Filesystem sharing