style(v3-languages): simplify include=external wording

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Daniel Jones

api-reference/languages/retrieve-supported-languages-by-resource.mdx

@@ -165,7 +165,7 @@ to request additional languages and features based on their availability status:
 | **Value** | **Effect** |
 |---|---|
 | `beta` | Includes languages and features in beta, in addition to stable |
-| `external` | Includes features that rely on external providers (orthogonal to stability level) |
+| `external` | Includes features that rely on third-party service providers |
 
 Values can be combined with repeated parameters: `?include=beta&include=external`.
 

api-reference/languages/v3-languages-changelog.mdx

@@ -65,7 +65,7 @@ By default (no parameter), only stable languages and features are returned.
 | **Value** | **Effect** |
 |---|---|
 | `beta` | Includes languages and features in beta, in addition to stable |
-| `external` | Includes features that rely on external providers (orthogonal to stability level) |
+| `external` | Includes features that rely on third-party service providers |
 
 Values are composable via repeated parameters: `?include=beta&include=external`.
 

api-reference/openapi.yaml

@@ -2118,7 +2118,7 @@ paths:
             (e.g. `?include=beta&include=external`).
 
             - `beta`: Include languages and features in beta, in addition to stable
-            - `external`: Include features that rely on external providers (orthogonal to stability level)
+            - `external`: Include features that rely on third-party service providers
       responses:
         200:
           description: JSON array where each item represents a supported language.