Add a response type for openExternalLink that returns a boolean opened value

Author: HamzaAtDiscord

docs/developer_tools/Embedded_App_SDK.mdx

@@ -524,7 +524,7 @@ No scopes required
 #### Signature
 
 <Monospace>
-openExternalLink(args: [OpenExternalLinkRequest](#DOCS_DEVELOPER_TOOLS_EMBEDDED_APP_SDK/openexternallinkrequest)): Promise\<void\>
+openExternalLink(args: [OpenExternalLinkRequest](#DOCS_DEVELOPER_TOOLS_EMBEDDED_APP_SDK/openexternallinkrequest)): Promise\<[OpenExternalLinkResponse](#DOCS_DEVELOPER_TOOLS_EMBEDDED_APP_SDK/openexternallinkresponse)\>
 </Monospace>
 
 #### Usage
@@ -1335,6 +1335,12 @@ No scopes required
 |----------|--------|
 | url      | string |
 
+#### OpenExternalLinkResponse
+
+| Property | Type    |
+|----------|---------|
+| opened   | boolean |
+
 #### OpenInviteDialogRequest
 
 | Property | Type   |