BEP174: fix some typos (#420)

Signed-off-by: murongshaozong <[email protected]>

BEPs/BEP174.md

@@ -76,7 +76,7 @@ function removeManagerByHimself() external
 Allows a manager to remove himself if required.
 
 ```
-fuction addManagerByGov(address) external onlyGov
+function addManagerByGov(address) external onlyGov
 ```
 Adds a Manager public key to the current set of Managers. This is only called via governance. Emits an event on success.
 
@@ -134,7 +134,7 @@ Update Relayer codebase to no longer register and deposit. Update abi? and run c
 
 ### 4.5 Existing relayer key migration
 
-Manager keys will need to be supplied for the existing two relayers.  Manger set will be seeded with these two Manager public keys.  Relayer public keys will be registered to these Managers.
+Manager keys will need to be supplied for the existing two relayers.  Manager set will be seeded with these two Manager public keys.  Relayer public keys will be registered to these Managers.
 
 Existing Relayers will need to pull down relayer code once the `RelayerHub` SC has been upgraded.