Update intro-to-zkevm.md (#129)

I changed a grammatical error which is:

In the sentence "These succinct proof can then be posted and verified on Ethereum Layer 1," I changed "proof" to "proofs" for grammatical accuracy.

src/content/docs/en/technology/zkevm/intro-to-zkevm.md

@@ -12,7 +12,7 @@ whatsnext: { "zkEVM Overview": "/technology/zkevm/zkevm-overview" }
 
 ZK rollups are widely recognized as the ideal scaling solution for Ethereum. They inherit the strong security of Ethereum Layer 1 and offer the fastest transaction finality compared to other Layer 2 solutions.
 
-The basic idea of a ZK rollup is to execute transactions off-chain and to generate succinct proofs of the execution’s validity. These succinct proof can then be posted and verified on Ethereum Layer 1. ZK rollups improve scalability since verifying the proof for a batch of transactions is much cheaper than re-executing the batch of transactions.
+The basic idea of a ZK rollup is to execute transactions off-chain and to generate succinct proofs of the execution’s validity. These succinct proofs can then be posted and verified on Ethereum Layer 1. ZK rollups improve scalability since verifying the proof for a batch of transactions is much cheaper than re-executing the batch of transactions.
 
 ZK rollups can be categorized into application-specific and general-purpose rollups, based on the types of transactions they support. Application-specific ZK rollups are designed for particular transaction sets, such as payments and swaps, or a player’s action set for an on-chain game. In these cases, rollups only need to generate proofs attesting to the correctness of the supported primitives, such as valid state transitions for game players.