Fixes comment URI

Author: EthanHeilman

bip-0347.mediawiki

@@ -4,7 +4,7 @@
   Title: OP_CAT
   Author: Ethan Heilman <[email protected]>
           Armin Sabouri <[email protected]>
-  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-op-cat
+  Comments-URI: https://github.com/bitcoin/bips/wiki/Comments:BIP-0347
   Status: Draft
   Type: Standards Track
   Created: 2023-10-21