docs(canton): fix CCT prerequisites, BurnMintFactory coverage, and ApplyChainUpdates example

[SyedAsadKazmi]

• Prerequisites (all CCT guides): DAR bullets now link the contracts/dars/released folder, require upload and vetting (link to Upgradability), and add the CommitteeVerifier DAR required for executing incoming transfers.
• BurnMint guide, factory coverage: new sections for custom tokens:
  • Pin the BurnMintFactory on the TAR via SetBurnMintFactory (LinkRegistry as the reference implementation)
  • Factory contract shape: top-level instanceId create argument required for EDS ACS indexing
  • Serving the factory from EDS: address vs url mode; testnet token-standard backend is https://api.utilities.digitalasset-staging.com (not a validator scan-proxy URL); url mode resolves registry instruments only
• Both guides: full ApplyChainUpdates JSON example: remoteChainSelectorsToRemove + chainsToAdd (list of ChainUpdate records, each carrying its own remoteChainSelector), not the pool's remoteChainConfigs create field.
• EDS concept page: fix dead lzrnd TAR address in the batch example (live: nbehb); add [factory].type row to the config reference.

[vercel]

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Project	Deployment	Actions	Updated
documentation	Ready	Preview	Oct 13, 2026 2:48am UTC