Merge bitcoin#13662: Explain when reindex-chainstate can be used inst…

…ead of reindex

65a449f Explain when reindex-chainstate can be used instead of reindex (Sjors Provoost)

Pull request description:

  Save users from having to Google this: https://bitcoin.stackexchange.com/a/60711

Tree-SHA512: 3128565d037c77265a2ecf3bce137b8d27740f513802a4e683be06f21a75b82ee6cc22eb903181c4f438a2990cb682ce1d076f4d3af33d5aaa79b783a9f664b1

src/init.cpp

@@ -531,7 +531,7 @@ void SetupServerArgs()
 
     gArgs.AddArg("-addressindex", strprintf("Maintain a full address index, used to query for the balance, txids and unspent outputs for addresses (default: %u)", DEFAULT_ADDRESSINDEX), false, OptionsCategory::INDEXING);
     gArgs.AddArg("-reindex", "Rebuild chain state and block index from the blk*.dat files on disk", false, OptionsCategory::INDEXING);
-    gArgs.AddArg("-reindex-chainstate", "Rebuild chain state from the currently indexed blocks", false, OptionsCategory::INDEXING);
+    gArgs.AddArg("-reindex-chainstate", "Rebuild chain state from the currently indexed blocks. When in pruning mode or if blocks on disk might be corrupted, use full -reindex instead.", false, OptionsCategory::INDEXING);
     gArgs.AddArg("-spentindex", strprintf("Maintain a full spent index, used to query the spending txid and input index for an outpoint (default: %u)", DEFAULT_SPENTINDEX), false, OptionsCategory::INDEXING);
     gArgs.AddArg("-timestampindex", strprintf("Maintain a timestamp index for block hashes, used to query blocks hashes by a range of timestamps (default: %u)", DEFAULT_TIMESTAMPINDEX), false, OptionsCategory::INDEXING);
     gArgs.AddArg("-txindex", strprintf("Maintain a full transaction index, used by the getrawtransaction rpc call (default: %u)", DEFAULT_TXINDEX), false, OptionsCategory::INDEXING);