Doc updated engine options and edit CLI page (#1041)

* doc updated engine options and edit CLI page

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* minor edit

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* minor edit

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* fix vale install process

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* reviewer comments

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* update engine api page

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* remove engine-rpc-enabled

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

* minor edits

Signed-off-by: Alexandra Tran <alexandra.tran@consensys.net>

Author: alexandratran

docs/HowTo/Interact/APIs/Engine-API.md

@@ -9,20 +9,18 @@ These [API methods](../../../Reference/Engine-API-Methods.md) are a separate sub
 
 ## Configure the Engine API
 
-To configure the Engine API, specify the [service ports](#service-ports) and [host allowlist](#host-allowlist).
-Also [enable the JSON-RPC](API.md#enabling-api-access).
-Ensure the [`ETH` method is enabled](Using-JSON-RPC-API.md#api-methods-enabled-by-default) (it's enabled by default).
+To configure the Engine API:
 
-### Service ports
-
-To specify the port the Engine API service listens on, use the
-[`--engine-rpc-http-port`](../../../Reference/CLI/CLI-Syntax.md#engine-rpc-http-port) or
-[`--engine-rpc-ws-port`](../../../Reference/CLI/CLI-Syntax.md#engine-rpc-ws-port) options.
+- [Enable the JSON-RPC API](API.md#enable-api-access).
+  Ensure the [`ETH` method is enabled](Using-JSON-RPC-API.md#api-methods-enabled-by-default) (it's enabled by default).
+- Specify the [service ports](#service-ports).
+- Specify the [host allowlist](#host-allowlist).
 
-The default ports are:
+### Service ports
 
-* 8550 over HTTP.
-* 8551 over WebSocket.
+To specify the port the Engine API service listens on for HTTP and WebSocket, use the
+[`--engine-rpc-port`](../../../Reference/CLI/CLI-Syntax.md#engine-rpc-port) option.
+The default is `8551`.
 
 ### Host allowlist