Use hyperlinks when mentioning bips

When mentioning a bip we use a hyperlink to the bip file to assist
readers. There are two mentions of bips in BIP-0009 that do not use
links, probably because links where provided above in the text, however,
its a bit easier on the reader if we provide links again to save
scrolling through the document.

Use hyperlinks when mentioning BIP 34 and 141 in isolation.

Author: tcharding

bip-0009.mediawiki

@@ -197,7 +197,7 @@ Miners MAY clear or set bits in the block version WITHOUT any special "mutable"
 Softfork deployment names listed in "rules" or as keys in "vbavailable" may be prefixed by a '!' character.
 Without this prefix, GBT clients may assume the rule will not impact usage of the template as-is; typical examples of this would be when previously valid transactions cease to be valid, such as BIPs [[bip-0016.mediawiki|16]], [[bip-0065.mediawiki|65]], [[bip-0066.mediawiki|66]], [[bip-0068.mediawiki|68]], [[bip-0112.mediawiki|112]], and [[bip-0113.mediawiki|113]].
 If a client does not understand a rule without the prefix, it may use it unmodified for mining.
-On the other hand, when this prefix is used, it indicates a more subtle change to the block structure or generation transaction; examples of this would be BIP 34 (because it modifies coinbase construction) and 141 (since it modifies the txid hashing and adds a commitment to the generation transaction).
+On the other hand, when this prefix is used, it indicates a more subtle change to the block structure or generation transaction; examples of this would be [[bip-0034.mediawiki|BIP 34]] (because it modifies coinbase construction) and [[bip-0141.mediawiki|141]] (since it modifies the txid hashing and adds a commitment to the generation transaction).
 A client that does not understand a rule prefixed by '!' must not attempt to process the template, and must not attempt to use it for mining even unmodified.
 
 ==Support for future changes==