fc-pattern, sv, tomb, xkill: add examples (#6121)

pages/linux/fc-pattern.md

@@ -5,4 +5,8 @@
 
 - Display default information about a font:
 
-`fc-pattern -d '{{DejaVu Serif}}'`
+`fc-pattern --default '{{DejaVu Serif}}'`
+
+- Display config information about a font:
+
+`fc-pattern --config '{{DejaVu Serif}}'`

pages/linux/tomb.md

@@ -11,6 +11,10 @@
 
 `tomb forge {{encrypted_directory.tomb.key}}`
 
+- Forcefully create a new key, even if the tomb isn't allowing key forging (due to swap):
+
+`tomb forge {{encrypted_directory.tomb.key}} -f`
+
 - Initialize and lock an empty tomb using a key made with `forge`:
 
 `tomb lock {{encrypted_directory.tomb}} -k {{encrypted_directory.tomb.key}}`