upd router docs

Author: sobolev-igor

docs/router.md

@@ -1,7 +1,7 @@
 # Router contract
 
 !!! note ""
-   Router contract is maintained in [`interactive-new`](https://github.com/zeriontech/defi-sdk/tree/interactive-new){target="_blank"} branch of defi-sdk repo.
+   Router contract is maintained in [`router`](https://github.com/zeriontech/defi-sdk/tree/router){target="_blank"} branch of defi-sdk repo.
 
 ## Main features
 
@@ -10,7 +10,7 @@
  - Three types of `permit()` functions for approving tokens in the same transaction (EIP2612, DAI-like, Yearn-like)
  - Two types of swaps: with fixed input amount or fixed output amount
  - Two types of fees:
-    - protocol fee managed by the Router contract owner with possibility of one-time discounts requiring signature of an address with the special role
+    - protocol fee managed by the **Router** contract owner with possibility of one-time discounts requiring signature of an address with the special role
     - marketplace fee managed by the transaction creator
  - Relayed transactions requiring just an EIP712 signature of the user