Update docs/pos/reference/contracts/delegation.md

Co-authored-by: kmurphypolygon <149679879+kmurphypolygon@users.noreply.github.com>

Author: EmpieichO

docs/pos/reference/contracts/delegation.md

@@ -29,7 +29,7 @@ Exchange rate is calculated as below:
 ExchangeRate = (totalDelegatedPower + delegatorRewardPool) / totalDelegatorShares
 ```
 
-## Methods and Variables
+## Methods and variables
 
 ### buyVoucher