docs(voice): mark Finnish transcription as provided by DeepL

[DVC-1200]

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Patrick Schlarmann

api-reference/voice.mdx

@@ -63,7 +63,7 @@ All source languages can be translated into any target language.
 | Dutch                            | ✓      | ✓      | ✓            |
 | English (American/British)       | ✓      | ✓      | ✓            |
 | Estonian                         | ○      | ✓      | —            |
-| Finnish                          | ○      | ✓      | ○            |
+| Finnish                          | ✓      | ✓      | ○            |
 | French                           | ✓      | ✓      | ✓            |
 | German                           | ✓      | ✓      | ✓            |
 | Greek                            | ○      | ✓      | ○            |