Merge pull request #13786 from ethereum/fixPortalNetworkTable

Change portal network image to table

Author: wackerow

public/content/developers/docs/networking-layer/portal-network/index.md

@@ -59,7 +59,13 @@ The benefits of this network design are:
 
 The diagram below shows the functions of existing clients that can be delivered by the Portal Network, enabling users to access these functions on very low-resource devices.
 
-![portal network table](portal-network-table2.png)
+### The Portal Networks
+
+| Beacon light client | State network                | Transaction gossip  | History network |
+| ------------------- | ---------------------------- | ------------------- | --------------- |
+| Beacon chain light  | Account and contract storage | Lightweight mempool | Headers         |
+| Protocol data       |                              |                     | Block bodies    |
+|                     |                              |                     | Receipts        |
 
 ## Client diversity by default {#client-diversity-as-default}