📄 docs: Update Speech-to-Text configuration link in upload_as_text documentation

Replaced the link for Speech-to-Text Configuration to point to the new location in the LibreChat YAML structure for better clarity and accuracy.

Author: danny-avila

pages/docs/features/upload_as_text.mdx

@@ -60,7 +60,7 @@ When you upload a file using "Upload as Text":
 **STT Processing (Optional):**
 - Converts audio files to text
 - Requires STT service configuration
-- See [Speech-to-Text Configuration](/docs/features/speech-to-text)
+- See [Speech-to-Text Configuration](/docs/configuration/librechat_yaml/object_structure/file_config#stt)
 
 ## Usage