apply suggested docs updates from code review

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

Author: skarim

docs/src/content/docs/faq.md

@@ -249,7 +249,7 @@ gh stack link change1 change2 change3
 
 This doesn't create any local tracking and only hits the APIs to create Stacked PRs.
 
-If the provided branches already have open PRs, `link` will use them. If not, it creates draft PRs with the correct base branch chaining.
+If the provided branches already have open PRs, `link` will use them. If not, it creates draft PRs by default with the correct base branch chaining.
 
 To add more to the stack, run `link` again, but be sure to include the full list of PRs/branches in the stack:
 

docs/src/content/docs/reference/cli.md

@@ -237,12 +237,12 @@ gh stack submit [flags]
 
 Creates a Stacked PR for every branch in the stack, pushing branches to the remote. After creating PRs, `submit` automatically creates a **Stack** on GitHub to link the PRs together. If the stack already exists on GitHub (e.g., from a previous submit), new PRs are added to the existing stack.
 
-When creating new PRs, you will be prompted to enter a title for each one. Press Enter to accept the default (branch name), or use `--auto` to skip prompting entirely.
+When creating new PRs, you will be prompted to enter a title for each one. Press Enter to accept the default (branch name), or use `--auto` to skip prompting entirely. New PRs are created as **drafts by default**; use `--open` to create new PRs as ready for review and to mark existing PRs as ready for review.
 
 | Flag | Description |
 |------|-------------|
 | `--auto` | Use auto-generated PR titles without prompting |
-| `--open` | Mark new and existing PRs as ready for review |
+| `--open` | Create new PRs as ready for review instead of drafts, and mark existing PRs as ready for review |
 | `--remote <name>` | Remote to push to (defaults to auto-detected remote) |
 
 **Examples:**