Update chainparams comment for more info on service bits per dnsseed

Author: TheBlueMatt

src/chainparams.cpp

@@ -124,7 +124,11 @@ class CMainParams : public CChainParams {
         assert(consensus.hashGenesisBlock == uint256S("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"));
         assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
 
-        // Note that of those with the service bits flag, most only support a subset of possible options
+        // Note that of those which support the service bits prefix, most only support a subset of
+        // possible options.
+        // This is fine at runtime as we'll fall back to using them as a oneshot if they dont support the
+        // service bits we want, but we should get them updated to support all service bits wanted by any
+        // release ASAP to avoid it where possible.
         vSeeds.emplace_back("seed.bitcoin.sipa.be"); // Pieter Wuille, only supports x1, x5, x9, and xd
         vSeeds.emplace_back("dnsseed.bluematt.me"); // Matt Corallo, only supports x9
         vSeeds.emplace_back("dnsseed.bitcoin.dashjr.org"); // Luke Dashjr