docs(api): complete truncated questionId description

The questionId row in the "Update question properties" table ended
mid-sentence with "Id of the". Completed it and aligned the wording and
capitalisation with the surrounding tables, which use "ID of the question
to delete" / "ID of the option to update".

Signed-off-by: Josef Behr <code@josef-behr.de>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: josefbehr

docs/API_v3.md

@@ -438,7 +438,7 @@ Update a single or multiple properties of a question-object.
   | Parameter | Type | Description |
   |-----------|---------|-------------|
   | _formId_ | Integer | ID of the form to request |
-  | _questionId_ | Integer | Id of the
+  | _questionId_ | Integer | ID of the question to update |
 - Parameters:
   | Parameter | Type | Description |
   |-----------|---------|-------------|