Fix extra "()" in staking page (#323)

* Fix extra "()" in staking page

* Update staking.md

docs/bcfusion/developers/staking.md

@@ -1,4 +1,4 @@
-[# Staking
+# Staking
 
 This guide provides an overview of the key operations of staking, including creating validators,
 editing validator information, and performing delegation operations.
@@ -249,4 +249,4 @@ To get more information of a specific validator, please refer to the following f
 ## Contract ABI
 
 For the full interfaces of `StakeHub`, please refer
-to [the ABI file](https://github.com/bnb-chain/bsc-genesis-contract/blob/bc-fusion/abi/stakehub.abi).]()
+to [the ABI file](https://github.com/bnb-chain/bsc-genesis-contract/blob/bc-fusion/abi/stakehub.abi).