Improve documentation for Clear and AddTable methods in NFT interface.

nft.go

@@ -7,9 +7,15 @@ import (
 // NFT A client for working with nftables
 type NFT interface {
 	// Clear clears all rules.
+	//
+	// This command is equivalent to:
+	//    nft flush ruleset
 	Clear() error
 
 	// AddTable adds a new table.
+	//
+	// This command is equivalent to:
+	//     nft add table (ip|ip6|inet|arp|bridge) {name}
 	AddTable(family FamilyType, name string) error
 }