Update docs/pos/get-started/becoming-a-validator.md

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

Author: hsutaiyu

docs/pos/get-started/becoming-a-validator.md

@@ -41,7 +41,6 @@ Heimdall is based on Tendermint.
     * GitHub repository: [Staking contracts](https://github.com/maticnetwork/contracts/tree/master/contracts/staking)
     * Blog post: [Heimdall](https://polygon.technology/blog/heimdall-vaibhav-chellani-the-all-seeing-all-hearing-protector-of-matic)
 
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 ### Bor
 
 Bor does the following: