docs: open the download page on its content

The which-pack page announced itself ("This page picks the right pack
for a setup") before naming a pack. The sentence goes, the pointer to
Getting started stays.

scripts/generate_site.py

@@ -4671,8 +4671,7 @@ Without them, the emulator either refuses to start the game or runs it with
 reduced accuracy. RetroBIOS maps those requirements to source-traced emulator
 profiles and verifies local content against the evidence each platform exposes.
 
-This page picks the right pack for a setup. For BIOS directory paths per
-platform, verification, and the CLI, see
+BIOS directory paths per platform, verification and the CLI are in
 [Getting started](wiki/getting-started.md).
 
 ## Quick install

tests/test_doc_surfaces.py

@@ -272,5 +272,20 @@ class ContributorChecksMatchCi(unittest.TestCase):
         )
 
 
+class PagesOpenOnTheirContent(unittest.TestCase):
+    """The download page said "This page picks the right pack for a setup"
+    before saying anything about a pack."""
+
+    def test_no_paragraph_announces_its_page(self):
+        import generate_site  # noqa: PLC0415
+
+        text = generate_site.generate_which_pack()
+        announcing = [
+            line for line in text.splitlines()
+            if re.match(r"(This|The) (page|section) ", line)
+        ]
+        self.assertEqual(announcing, [])
+
+
 if __name__ == "__main__":
     unittest.main()