updated manual on XRB → NANO ccxt#3131 ccxt#2007 ccxt#3301

wiki/Manual.md

@@ -726,7 +726,7 @@ Historically various symbolic names have been used to designate same trading pai
 - `BCC → BCH`: The Bitcoin Cash fork is often called with two different symbolic names: `BCC` and `BCH`. The name `BCC` is ambiguous for Bitcoin Cash, it is confused with BitConnect. The ccxt library will convert `BCC` to `BCH` where it is appropriate (some exchanges and aggregators confuse them).
 - `DRK → DASH`: `DASH` was Darkcoin then became Dash ([read more](https://minergate.com/blog/dashcoin-and-dash/)).
 - `DSH → DASH`: Try not to confuse symbols and currencies. The `DSH` (Dashcoin) is not the same as `DASH` (Dash). Some exchanges have `DASH` labelled inconsistently as `DSH`, the ccxt library does a correction for that as well (`DSH → DASH`), but only on certain exchanges that have these two currencies confused, whereas most exchanges have them both correct. Just remember that `DASH/BTC` is not the same as `DSH/BTC`.
-- `NANO` → `XRB`: `NANO` is the newer code for Raiblocks, however, CCXT unified API uses the older `XRB` for backward-compatibility with existing exchanges and data providers.
+- `XRB` → `NANO`: `NANO` is the newer code for RaiBlocks, thus, CCXT unified API uses will replace the older `XRB` with `NANO` where needed. https://hackernoon.com/nano-rebrand-announcement-9101528a7b76
 
 #### Notes On Naming Consistency