Update services metadata (#2040)

* Update services metadata

* address reviewer comments

Author: alexandratran

services/get-started/infura.md

@@ -50,7 +50,7 @@ view your API key.
 ## 3. Send requests
 
 Use the API key when sending requests. The following examples interact with the Ethereum network by
-sending requests using HTTP:
+sending requests using HTTP.
 
 :::info
 
@@ -62,6 +62,23 @@ sending requests using HTTP:
 
 Use a tool such as the [Client Uniform Resource Locator (curl)](../concepts/curl.md) or [Postman](https://www.postman.com/downloads/) to make requests.
 
+<details>
+<summary>Supported API methods</summary>
+<div>
+  View the supported API methods for each network in the **Reference** section in the left sidebar.
+  The following methods are not supported on any network by Infura:
+
+  - `eth_coinbase`
+  - `eth_sendTransaction`
+  - `eth_sign`
+
+  Infura doesn't store the user's private key required to sign transactions.
+  You can use [`web3.eth.sendTransaction`](https://web3js.readthedocs.io/en/v1.2.0/web3-eth.html#sendtransaction),
+  which signs the transaction locally using the private key of the account, and sends the transaction via [`web3.eth.sendSignedTransaction`](https://web3js.readthedocs.io/en/v1.2.0/web3-eth.html#sendsignedtransaction),
+  which is a wrapper for [`eth_sendRawTransaction`](../reference/ethereum/json-rpc-methods/eth_sendrawtransaction.mdx).
+</div>
+</details>
+
 ### 3.1 Get the current block number
 
 Retrieve the current block number.

services/reference/_partials/_eth_coinbase-description.mdx

@@ -1 +1 @@
-Returns information about a block whose hash is in the request.
+Returns information about a block given its block hash.

services/reference/_partials/_eth_getblockbyhash-description.mdx

@@ -1 +1 @@
-Returns information about a block by hash.
+Returns information about a block given its block number.

services/reference/_partials/_eth_getblockbynumber-description.mdx

@@ -1,12 +1,16 @@
 ---
-title: "eth_accounts"
+title: Arbitrum eth_accounts
+sidebar_label: eth_accounts
+description: Returns a list of Arbitrum addresses.
 ---
 
 import Tabs from "@theme/Tabs"
 import TabItem from "@theme/TabItem"
 
 import Description from "/services/reference/_partials/_eth_accounts-description.mdx"
 
+# `eth_accounts`
+
 <Description />
 
 ## Parameters

services/reference/_partials/_eth_sendtransaction-description.mdx

@@ -1,12 +1,16 @@
 ---
-title: "eth_blockNumber"
+title: Arbitrum eth_blockNumber
+sidebar_label: eth_blockNumber
+description: Returns the latest Arbitrum block number.
 ---
 
 import Tabs from "@theme/Tabs"
 import TabItem from "@theme/TabItem"
 
 import Description from "/services/reference/_partials/_eth_blocknumber-description.mdx"
 
+# `eth_blockNumber`
+
 <Description />
 
 ## Parameters

services/reference/_partials/_eth_sign-description.mdx

@@ -1,12 +1,16 @@
 ---
-title: "eth_call"
+title: Arbitrum eth_call
+sidebar_label: eth_call
+description: Executes an Arbitrum call without creating a transaction.
 ---
 
 import Tabs from "@theme/Tabs"
 import TabItem from "@theme/TabItem"
 
 import Description from "/services/reference/_partials/_eth_call-description.mdx"
 
+# `eth_call`
+
 <Description />
 
 ## Parameters