chore(README.md): Add Links to mentioned tech

Adds links to related tech mentioned in examples/README.
This is useful to people new to the field, like me.

Pull-Request: #6016.

Author: hoijui

examples/README.md

@@ -24,19 +24,26 @@ Each example includes its own README.md file with specific instructions on how t
 
 ## Individual libp2p features
 
-- [Chat](./chat) A basic chat application demonstrating libp2p and the mDNS and Gossipsub protocols.
-- [Distributed key-value store](./distributed-key-value-store) A basic key value store demonstrating libp2p and the mDNS and Kademlia protocol.
+- [Chat](./chat) A basic chat application demonstrating libp2p and the [mDNS] and [Gossipsub] protocols.
+- [Distributed key-value store](./distributed-key-value-store) A basic key value store demonstrating libp2p and the [mDNS] and [Kademlia] protocol.
 
 - [File sharing application](./file-sharing) Basic file sharing application with peers either providing or locating and getting files by name.
 
-  While obviously showcasing how to build a basic file sharing application with the Kademlia and
-  Request-Response protocol, the actual goal of this example is **to show how to integrate
+  While obviously showcasing how to build a basic file sharing application with the [Kademlia] and
+  [Request-Response] protocol, the actual goal of this example is **to show how to integrate
   rust-libp2p into a larger application**.
 
-- [IPFS Kademlia](./ipfs-kad) Demonstrates how to perform Kademlia queries on the IPFS network.
+- [IPFS Kademlia](./ipfs-kad) Demonstrates how to perform [Kademlia] queries on the [IPFS] network.
 
-- [IPFS Private](./ipfs-private) Implementation using the gossipsub, ping and identify protocols to implement the ipfs private swarms feature.
+- [IPFS Private](./ipfs-private) Implementation using the [Gossipsub], ping and identify protocols to implement the IPFS private swarms feature.
 
 - [Ping](./ping) Small `ping` clone, sending a ping to a peer, expecting a pong as a response. See [tutorial](../libp2p/src/tutorials/ping.rs) for a step-by-step guide building the example.
 
-- [Rendezvous](./rendezvous) Rendezvous Protocol. See [specs](https://github.com/libp2p/specs/blob/master/rendezvous/README.md).
+- [Rendezvous](./rendezvous) [Rendezvous] Protocol. See [specs](https://github.com/libp2p/specs/blob/master/rendezvous/README.md).
+
+[mDNS]: https://github.com/libp2p/specs/blob/master/discovery/mdns.md
+[Gossipsub]: https://github.com/libp2p/specs/tree/master/pubsub/gossipsub
+[Kademlia]: https://github.com/libp2p/specs/blob/master/kad-dht/README.md
+[Request-Response]: https://en.wikipedia.org/wiki/Request%E2%80%93response
+[IPFS]: https://ipfs.tech/
+[Rendezvous]: https://github.com/libp2p/specs/blob/master/rendezvous/README.md