message: doc: /rest/block responds with 404 if block does not exist
diff: @@ -27,6 +27,7 @@ For full TX query capability, one must enable the transaction index via "txindex
  `GET /rest/block/notxdetails/<BLOCK-HASH>.<bin|hex|json>`
  Given a block hash: returns a block, in binary, hex-encoded binary or JSON formats.
  +Responds with 404 if the block doesn't exist.
  The HTTP request and response are both handled entirely in-memory, thus making maximum memory usage at least 2.66MB (1 MB max block, plus hex encoding) per request.
  