docs: reword checklist as generating quality checklists, not validating directly

Address review: /speckit.checklist generates quality checklists (which then validate the requirements) rather than validating directly, matching the CLI/README phrasing. Preserves the after-plan ordering.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jawwad-ali

docs/quickstart.md

@@ -16,7 +16,7 @@ After installing Spec Kit and defining your project constitution, quick experime
 /speckit.constitution -> /speckit.specify -> /speckit.clarify -> /speckit.plan -> /speckit.checklist -> /speckit.tasks -> /speckit.analyze -> /speckit.implement
 ```
 
-Use `/speckit.clarify` to reduce requirement ambiguity before planning, `/speckit.checklist` to validate requirements quality once the plan exists, and `/speckit.analyze` to check spec/plan/task consistency before implementation starts. You can repeat `/speckit.analyze` after implementation as an extra review, but keep the first analysis before `/speckit.implement` so gaps are caught while the plan and tasks can still be adjusted.
+Use `/speckit.clarify` to reduce requirement ambiguity before planning, `/speckit.checklist` to generate quality checklists for the requirements once the plan exists, and `/speckit.analyze` to check spec/plan/task consistency before implementation starts. You can repeat `/speckit.analyze` after implementation as an extra review, but keep the first analysis before `/speckit.implement` so gaps are caught while the plan and tasks can still be adjusted.
 
 ### Step 1: Install Specify
 
@@ -83,7 +83,7 @@ uvx --from git+https://github.com/github/spec-kit.git specify init <PROJECT_NAME
 /speckit.plan The application uses Vite with minimal number of libraries. Use vanilla HTML, CSS, and JavaScript as much as possible. Images are not uploaded anywhere and metadata is stored in a local SQLite database.
 ```
 
-Then validate quality with `/speckit.checklist` once the plan exists:
+Then generate a quality checklist with `/speckit.checklist` once the plan exists:
 
 ```bash
 /speckit.checklist