use headings, fix link

Author: leemthompo

docs/reference/query-languages/esql/_snippets/commands/layout/completion.md

@@ -7,13 +7,13 @@ stack: preview 9.1.0
 
 The `COMPLETION` command allows you to send prompts and context to a Large Language Model (LLM) directly within your ES|QL queries, to perform text generation tasks.
 
-**Syntax**
+### Syntax
 
 ```esql
 COMPLETION [column =] prompt WITH inference_id
 ```
 
-**Parameters**
+### Parameters
 
 `column`
 :   (Optional) The name of the output column containing the LLM's response.
@@ -28,7 +28,7 @@ COMPLETION [column =] prompt WITH inference_id
 :   The ID of the [inference endpoint](docs-content://explore-analyze/elastic-inference/inference-api.md) to use for the task.
     The inference endpoint must be configured with the `completion` task type.
 
-**Description**
+## Description
 
 The `COMPLETION` command provides a general-purpose interface for
 text generation tasks using a Large Language Model (LLM) in ES|QL.
@@ -43,13 +43,13 @@ including:
 - Content rewriting
 - Creative generation
 
-**Requirements**
+## Requirements
 
 To use this command, you must deploy your LLM model in Elasticsearch as
 an [inference endpoint](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-inference-put) with the
 task type `completion`.
 
-**Handling timeouts**
+### Handling timeouts
 
 `COMPLETION` commands may time out when processing large datasets or complex prompts. To increase timeout limits for these operations, the configuration methods vary by deployment type:
 
@@ -75,7 +75,7 @@ Requires a manual override from Elastic Support as users cannot modify timeout s
 
 * Reduce data volume with `LIMIT` or more selective filters before the `COMPLETION` command
 * Split complex operations into multiple simpler queries 
-* Configure your HTTP client's response timeout (Refer to [HTTP client configuration](/reference/configuration-reference/networking-settings.md#_http_client_configuration)
+* Configure your HTTP client's response timeout (Refer to [HTTP client configuration](/reference/elasticsearch/configuration-reference/networking-settings.md#_http_client_configuration)
 
 **Examples**