Merge pull request #8326 from strykerin/patch-6

add missing `` to PING on networking-layer markdown

src/content/developers/docs/networking-layer/index.md

@@ -31,7 +31,7 @@ Discovery is the process of finding other nodes in network. This is bootstrapped
 
 The protocol used for the node-bootnode interactions is a modified form of [Kademlia](https://medium.com/coinmonks/a-brief-overview-of-kademlia-and-its-use-in-various-decentralized-platforms-da08a7f72b8f) which uses a [distributed hash table](https://en.wikipedia.org/wiki/Distributed_hash_table) to share lists of nodes. Each node has a version of this table containing the information required to connect to its closest peers. This 'closeness' is not geographical - distance is defined by the similarity of the node's ID. Each node's table is regularly refreshed as a security feature. For example, in the [Discv5](https://github.com/ethereum/devp2p/tree/master/discv5), discovery protocol nodes are also able to send 'ads' that display the subprotocols that the client supports, allowing peers to negotiate about the protocols they can both use to communicate over.
 
-Discovery starts wih a game of PING-PONG. A successful PING-PONG "bonds" the new node to a bootnode. The initial message that alerts a bootnode to the existence of a new node entering the network is a `PING`. This `PING` includes hashed information about the new node, the bootnode and an expiry time-stamp. The bootnode receives the PING and returns a `PONG` containing the `PING` hash. If the `PING` and `PONG` hashes match then the connection between the new node and bootnode is verified and they are said to have "bonded".
+Discovery starts wih a game of PING-PONG. A successful PING-PONG "bonds" the new node to a bootnode. The initial message that alerts a bootnode to the existence of a new node entering the network is a `PING`. This `PING` includes hashed information about the new node, the bootnode and an expiry time-stamp. The bootnode receives the `PING` and returns a `PONG` containing the `PING` hash. If the `PING` and `PONG` hashes match then the connection between the new node and bootnode is verified and they are said to have "bonded".
 
 Once bonded, the new node can send a `FIND-NEIGHBOURS` request to the bootnode. The data returned by the bootnode includes a list of peers that the new node can connect to. If the nodes are not bonded, the `FIND-NEIGHBOURS` request will fail, so the new node will not be able to enter the network.