fix: this is specific to an existing standard only

bip-0048.mediawiki

@@ -84,7 +84,7 @@ Hardened derivation is used at this level.
 ===Script===
 
 This level splits the key space into two separate <code>script_type</code>(s). To provide
-backward and forward compatibility.
+backward compatibility.
 
 The recommended default is pay to witness script hash <code>m/48'/0'/0'/2'</code>.