Fix APM ES config documentation to correctly indicate applicability to both binary and Fleet-managed deployments (#3343)

## Problem

The APM Elasticsearch output configuration documentation incorrectly
indicated that it only applies to APM Server binary users and not
Fleet-managed users. This was misleading because the ES configuration
options described are actually applicable to both deployment methods.

## Solution

Updated the documentation to correctly reflect that:

- The configuration options apply to **both** APM Server binary and
Fleet-managed users
- The YAML configuration examples are specific to binary users
- Fleet-managed users should configure these same APM-specific ES output
settings through the Fleet UI
- These APM-specific settings are distinct from the general Fleet ES
output settings

## Changes Made

1. **Updated deployment indicator**: Changed from
`observability-binary-yes-fm-no.svg` to
`observability-binary-yes-fm-yes.svg` to show support for both
deployment methods
2. **Revised note text**: Clarified that while the configs apply to both
methods, the configuration approach differs:
   - Binary users: Configure via YAML (as shown in examples)
- Fleet-managed users: Configure via Fleet UI (not the general Fleet ES
output settings)

## Impact

This fix ensures users understand that the valuable APM-specific
Elasticsearch output configurations documented in this page are
available to all APM users, regardless of their deployment method.
Fleet-managed users will no longer be incorrectly directed away from
APM-specific settings to general Fleet settings.

Fixes: elastic/apm-server#18937

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<details>

<summary>Original prompt</summary>

> 
> ----
> 
> *This section details on the original issue you should resolve*
> 
> <issue_title>[Internal]: APM ES config incorrectly labeled as not
applicable to fleet-managed APM</issue_title>
> <issue_description>### Description
> 
> Mirrors issue elastic/apm-server#18937
> 
> In
https://www.elastic.co/docs/solutions/observability/apm/apm-server/configure-elasticsearch-output
,
> 
> > This documentation only applies to APM Server binary users.
Fleet-managed users should see [Configure the Elasticsearch
output](https://www.elastic.co/docs/reference/fleet/elasticsearch-output).
> 
> but this is not accurate. The ES configs listed in [APM ES output
docs](https://www.elastic.co/docs/solutions/observability/apm/apm-server/configure-elasticsearch-output)
are applicable to both standalone and fleet-managed, but the way to
configure them through yaml is specific to standalone. Fleet-managed APM
needs to configure the [APM ES output configs
](https://www.elastic.co/docs/solutions/observability/apm/apm-server/configure-elasticsearch-output)(not
[Fleet ES output
configs](https://www.elastic.co/docs/reference/fleet/elasticsearch-output))
via fleet UI
> 
> ### Resources
> 
>
https://www.elastic.co/docs/solutions/observability/apm/apm-server/configure-elasticsearch-output
> 
> ### Which documentation set does this change impact?
> 
> Elastic On-Prem and Cloud (all)
> 
> ### Feature differences
> 
> Applies to both on-prem and cloud
> 
> ### What release is this request related to?
> 
> 9.2
> 
> ### Serverless release
> 
> NA
> 
> ### Collaboration model
> 
> The documentation team
> 
> ### Point of contact.
> 
> **Main contact:** @carsonip 
> 
> **Stakeholders:**
> </issue_description>
> 
> ## Comments on the Issue (you are @copilot in this section)
> 
> <comments>
> </comments>
> 


</details>
Fixes #3342

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---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: carsonip <[email protected]>
Co-authored-by: Carson Ip <[email protected]>
Co-authored-by: Colleen McGinnis <[email protected]>

Author: 3 people

solutions/observability/apm/apm-server/configure-elasticsearch-output.md

@@ -12,9 +12,12 @@ products:
 # Configure the Elasticsearch output for APM Server[apm-elasticsearch-output]
 
 ::::{note}
-![supported deployment methods](/solutions/images/observability-binary-yes-fm-no.svg "")
+![supported deployment methods](/solutions/images/observability-binary-yes-fm-yes.svg "")
 
-This documentation only applies to APM Server binary users. Fleet-managed users should see [Configure the {{es}} output](/reference/fleet/elasticsearch-output.md).
+The configuration options described here apply to both APM Server binary and Fleet-managed users, but how they are specified varies:
+
+* **APM Server binary users**: Use the syntax in YAML configuration examples shown below in your configuration file.
+* **Fleet-managed users**: Use the same APM-specific {{es}} output settings outlined below, but [configure them in the Fleet UI](/reference/fleet/fleet-settings.md#output-settings).
 
 ::::