Fix broken links in BIP 13

Author: danra

bip-0013.mediawiki

@@ -14,15 +14,15 @@
 
 This BIP describes a new type of Bitcoin address to support arbitrarily complex transactions.  Complexity in this context is defined as what information is needed by the recipient to respend the received coins, in contrast to needing a single ECDSA private key as in current implementations of Bitcoin.
 
-In essence, an address encoded under this proposal represents the encoded hash of a [[script]], rather than the encoded hash of an ECDSA public key.
+In essence, an address encoded under this proposal represents the encoded hash of a [https://en.bitcoin.it/wiki/Script script], rather than the encoded hash of an ECDSA public key.
 
 ==Motivation==
 
 Enable "end-to-end" secure wallets and payments to fund escrow transactions or other complex transactions.  Enable third-party wallet security services.
 
 ==Specification==
 
-The new bitcoin address type is constructed in the same manner as existing bitcoin addresses (see [[Base58Check encoding]]):
+The new bitcoin address type is constructed in the same manner as existing bitcoin addresses (see [https://en.bitcoin.it/Base58Check_encoding Base58Check encoding]):
 
     base58-encode: [one-byte version][20-byte hash][4-byte checksum]