docs(sdc) update wording for populate

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: Ardenexal

docs/sdc/overview.md

@@ -1,5 +1,5 @@
 ---
-description: Populate and extract FHIR resources for SDC Questionnaires.
+description: Populate QuestionnaireResponses and extract FHIR resources for SDC Questionnaires.
 icon: file-export
 ---