multiple pages: change user_name to username (#3841)

pages/linux/chage.md

@@ -4,15 +4,15 @@
 
 - List password information for the user:
 
-`chage -l {{user_name}}`
+`chage -l {{username}}`
 
 - Enable password expiration in 10 days:
 
-`sudo chage -M {{10}} {{user_name}}`
+`sudo chage -M {{10}} {{username}}`
 
 - Disable password expiration:
 
-`sudo chage -M -1 {{user_name}}`
+`sudo chage -M -1 {{username}}`
 
 - Set account expiration date:
 

pages/linux/htop.md

@@ -8,7 +8,7 @@
 
 - Start htop displaying only processes owned by given user:
 
-`htop -u {{user_name}}`
+`htop -u {{username}}`
 
 - Get help about interactive commands:
 

pages/linux/smbpasswd.md

@@ -9,12 +9,12 @@
 
 - Add a specified user to Samba and set password(user should already exist in system):
 
-`smbpasswd -a {{user_name}}`
+`smbpasswd -a {{username}}`
 
 - Modify an existing Samba user's password:
 
-`smbpasswd {{user_name}}`
+`smbpasswd {{username}}`
 
 - Delete a Samba user:
 
-`smbpasswd -x {{user_name}}`
+`smbpasswd -x {{username}}`

pages/linux/top.md

@@ -12,7 +12,7 @@
 
 - Show only processes owned by given user:
 
-`top -u {{user_name}}`
+`top -u {{username}}`
 
 - Show the individual threads of a given process: