docs(bip-0046): apply minor wording improvement suggestions

by @AdamISZ

Author: theborakompanioni

bip-0046.mediawiki

@@ -73,7 +73,7 @@ m / 84' / 0' / 0' / 2 / index
 A key derived with this derivation path pattern will be referred to as <tt>derived_key</tt> further
 in this document.
 
-For <tt>index</tt>, addresses are numbered from 0 in a sequentially increasing manner, but index does not increase forever like in other similar standards. The index only goes up to <tt>959</tt> inclusive. Only 960 addresses can be derived for a given BIP32 master key. Furthermore there is no concept of a gap limit, instead wallets must always generate all 960 addresses and check for all of them if they have a balance and history.
+For <tt>index</tt>, addresses are numbered from 0 in a sequentially increasing manner with a fixed upper bound: The index only goes up to <tt>959</tt> inclusive. Only 960 addresses can be derived for a given BIP32 master key. Furthermore there is no concept of a gap limit, instead wallets must always generate all 960 addresses and check for all of them if they have a balance and history.
 
 === Timelock derivation ===