Update content/md/en/docs/learn/networks-and-nodes.md

Co-authored-by: Shawn Tabrizi <[email protected]>

Author: Hugo-Trentesaux

content/md/en/docs/learn/networks-and-nodes.md

@@ -46,7 +46,7 @@ Full nodes store blockchain data and, typically, participate in common blockchai
 By default, full nodes are configured to store all the blocks but only the most recent 256 states. They discard states older than that — with the exception of the genesis block — to prevent the full node from consuming too much disk space.
 You can configure the number of blocks a full node retains (see `--state-pruning` and `--blocks-pruning` options).
 
-Although older states are discarded, full nodes retain all the blocks from genesis to the head, allowing to rebuild all the intermediate states.
+Although older states are discarded, full nodes retain all the blocks from genesis to the head, allowing them to rebuild all the intermediate states.
 It is achieved by taking the genesis state as initial state and executing all the blocks successively on top of if.
 Retrieving information about some previous state thus requires an expensive computation which can be avoided by using an archive node, which does not discard the states.