replace − with dash(-)

pages/linux/lsblk.md

@@ -8,20 +8,20 @@
 
 - Also list empty devices:
 
-`lsblk −a`
+`lsblk -a`
 
 - Print the SIZE column in bytes rather than in a human-readable format:
 
-`lsblk −b`
+`lsblk -b`
 
 - Output info about filesystems:
 
-`lsblk −f`
+`lsblk -f`
 
 - Use ASCII characters for tree formatting:
 
-`lsblk −i`
+`lsblk -i`
 
 - Output info about block-device topology:
 
-`lsblk −t`
+`lsblk -t`