Adds links to token standards in API docs

apps/block_scout_web/lib/block_scout_web/etherscan.ex

@@ -821,7 +821,9 @@ defmodule BlockScoutWeb.Etherscan do
 
   @token_gettoken_action %{
     name: "getToken",
-    description: "Get ERC-20 or ERC-721 token by contract address.",
+    description:
+      "Get <a href='https://github.com/ethereum/EIPs/issues/20'>ERC-20</a>" <>
+        "or <a href='https://github.com/ethereum/EIPs/issues/721'>ERC-721</a> token by contract address.",
     required_params: [
       %{
         key: "contractaddress",
@@ -858,7 +860,10 @@ defmodule BlockScoutWeb.Etherscan do
 
   @stats_tokensupply_action %{
     name: "tokensupply",
-    description: "Get an ERC-20 or ERC-721 token total supply by contract address.",
+    description:
+      "Get <a href='https://github.com/ethereum/EIPs/issues/20'>ERC-20</a> or " <>
+        "<a href='https://github.com/ethereum/EIPs/issues/721'>ERC-721</a> " <>
+        " token total supply by contract address.",
     required_params: [
       %{
         key: "contractaddress",

apps/block_scout_web/lib/block_scout_web/templates/api_docs/_action_tile.html.eex

@@ -7,7 +7,7 @@
         <span class="badge badge-primary tile-badge float-right mr-1"><%= gettext "GET" %></span>
         <strong class="tile-label"><%= @action.name %></strong>
       </h3>
-      <h4 class="text-dark"><%= @action.description %></h4>
+      <h4 class="text-dark"><%= raw @action.description %></h4>
       <code><%= raw query_params(@module_name, @action) %></code>
     </button>
   </div>