Clarify proxy configuration setting for Docker Desktop (#25303)

Added note about proxy configuration requirements for Docker Desktop.

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## Description

<!-- Tell us what you did and why -->
Proxy configuration is a special case that needs configuration in Admin
Console as well as in admin-settings.json/install-settings.json. Most
customers miss the proxy configuration in
admin-settings/install-settings.json resulting in sign-in issues with
DD. Hopefully this will reduce the cases or at least we can point them
to this updated manual.
## Related issues or tickets
https://docker.atlassian.net/browse/SEG-1703
<!-- Related issues, pull requests, or Jira tickets -->

## Reviews

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- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

---------

Co-authored-by: Allie Sadler <102604716+aevesdocker@users.noreply.github.com>

Author: karman-docker

content/manuals/enterprise/security/hardened-desktop/settings-management/configure-json-file.md

@@ -317,6 +317,17 @@ The following tables describe all available settings in the `admin-settings.json
 | `pac`                |              | Specifies a PAC file URL. For example, `"pac": "http://proxy/proxy.pac"`.                                                                                                                                                                                                                                                                                                                                                                                               |                                        |
 | `embeddedPac`        |              | Specifies an embedded PAC (Proxy Auto-config) script. For example, `"embeddedPac": "function FindProxyForURL(url, host) { return \"DIRECT\"; }"`. This setting takes precedence over HTTP, HTTPS, Proxy bypass and PAC server URL.                                                                                                                                                                                                                                      |  |
 
+> [!NOTE]
+>
+> Proxy configuration is a special case because it must be configured in two places:
+>
+> 1. In the Admin Console for your organization.
+> 2. On the user's system where Docker Desktop is installed.
+>
+> On the user's machine, configure the proxy either through the `admin-settings.json` file or by using installer flags during Docker Desktop installation. For detailed instructions, refer to the [installation guide](/manuals/desktop/setup/install/windows-install.md#proxy-configuration).
+> 
+> This additional configuration is required because Docker Desktop must know which proxy server to use before it can complete user sign-in and retrieve organization settings from the Admin Console.
+
 ### Container proxy
 
 | Parameter         | OS  | Description                                                                                                                                                                                                                                         | Version                                |

content/manuals/enterprise/security/hardened-desktop/settings-management/settings-reference.md

@@ -324,6 +324,17 @@ Keeps image metadata current by indexing during idle time or after image operati
 
 ## Proxy
 
+> [!NOTE]
+>
+> Proxy configuration is a special case because it must be configured in two places:
+>
+> 1. In the Admin Console for your organization.
+> 2. On the user's system where Docker Desktop is installed.
+>
+> On the user's machine, configure the proxy either through the `admin-settings.json` file or by using installer flags during Docker Desktop installation. For detailed instructions, refer to the [installation guide](/manuals/desktop/setup/install/windows-install.md#proxy-configuration).
+> 
+> This additional configuration is required because Docker Desktop must know which proxy server to use before it can complete user sign-in and retrieve organization settings from the Admin Console.
+
 ### Embedded PAC script 
 
 Specifies an embedded Proxy Auto-Config (PAC) script. For example: `"embeddedPac": "function FindProxyForURL(url, host) { return \"DIRECT\"; }"`.