xhost: add page (#16283)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/xhost.md

@@ -0,0 +1,28 @@
+# xhost
+
+> Manage access control lists for X server connections.
+> More information: <https://manned.org/xhost>.
+
+- Display the current access control list:
+
+`xhost`
+
+- Allow a specific host to connect to the X server:
+
+`xhost +{{hostname}}`
+
+- Deny a specific host from connecting to the X server:
+
+`xhost -{{hostname}}`
+
+- Allow all hosts to connect (disable access control — insecure):
+
+`xhost +`
+
+- Deny all hosts except those explicitly allowed (enable access control):
+
+`xhost -`
+
+- Remove a specific user or address using a family prefix (like `inet:hostname` or `si:localuser:username`):
+
+`xhost -{{family:name}}`