Fix canonical in a safe way (GitbookIO#2589)

Author: gregberge

packages/gitbook/src/app/(site)/(content)/[[...pathname]]/page.tsx

@@ -150,7 +150,8 @@ export async function generateMetadata({
  .join(' | '),
  description: page.description ?? '',
  alternates: {
- canonical: absoluteHref(getPagePath(pages, page), true),
+ // Trim trailing slashes in canonical URL to match the redirect behavior
+ canonical: absoluteHref(getPagePath(pages, page), true).replace(/\/+$/, ''),
  },
  openGraph: {
  images: [