message: [network] add descriptions to constants
  Closes:
diff: // data. If you run into a limit and believe that it is unreasonably tight, please submit a PR
  // with your use-case. If you do change a value, please add a comment linking to the PR which
  // advocated the change.
  -// TODO: Each of these should be commented with semantic meaning, intended use place, and justification for the value.
  -// TODO: Better --- these should be encapsulated in configurations somewhere.
  +/// The timeout for any inbound RPC call before it's cut off
  pub const INBOUND_RPC_TIMEOUT_MS: u64 = 10_000;
  +/// Limit on concurrent Outbound RPC requests before backpressure is applied
  pub const MAX_CONCURRENT_OUTBOUND_RPCS: u32 = 100;
  +/// Limit on concurrent Inbound RPC requests before backpressure is applied
  pub const MAX_CONCURRENT_INBOUND_RPCS: u32 = 100;
  // These are only used in tests
  