wg: refresh and add French translation (#6687)

pages/linux/wg.md

@@ -5,16 +5,16 @@
 
 - Check status of currently active interfaces:
 
-`sudo wg`
+`wg`
 
-- Print a new private key:
+- Generate a new private key:
 
 `wg genkey`
 
-- Print a new public key:
+- Generate a public key from a private key:
 
-`echo {{private_key}} | wg pubkey`
+`wg pubkey < {{path/to/private_key}} > {{path/to/public_key}}`
 
 - Generate a public and private key:
 
-`wg genkey | tee {{privatekey.txt}} | wg pubkey > {{publickey.txt}}`
+`wg genkey | tee {{path/to/private_key}} | wg pubkey > {{path/to/public_key}}`