Update web3-and-polkadot.md (#6404)

Making the first sentence a complete sentence.

In the second sentence, improving the link to the previous one, and improving the grammar.

docs/general/web3-and-polkadot.md

@@ -79,10 +79,10 @@ distributed state machines where increments of data are stored within blocks tha
 other using hash functions. For example, the hash of block `N + 1` contains data of that block
 together with the hash of the previous block `N`. This creates the situation where if you modify the
 content of block `N` you will change the hash of block `N + 1`, `N + 2`, etc. essentially breaking
-the chain. Although it can be possible to add an invalid block (a block with invalid transactions)
-or censor certain transactions, if the blockchain network is not sufficiently decentralized. In
-decentralized proof-of-stake blockchains like Polkadot such attacks are financially expensive, and
-attempting to do it can get you [slashed](../learn/learn-offenses.md).
+the chain. If a blockchain network is not sufficiently decentralized, it can be possible to add an 
+invalid block (a block with invalid transactions) or to censor certain transactions. In decentralized
+proof-of-stake blockchains like Polkadot however, such attacks are financially expensive and 
+attempting them can get you [slashed](../learn/learn-offenses.md).
 
 So, with blockchain as a means of storing data and transactions permanently without an option to
 modify them, we can ensure what we cryptographically sign with our digital identity is set in stone