fix: align tests with the new help and messages

The --skip-packs help and the validate_pr fetch error were reworded, and a batocera page with no tab bar is plain Markdown that keeps the underscore entity, read here as a browser shows it.

scripts/validate_pr.py

@@ -632,7 +632,7 @@ def _project_main_line() -> str | None:
     if fetched.returncode != 0:
         raise RuntimeError(
             f"this clone does not hold the main of {PROJECT_URLS[0]}, and "
-            f"fetching it from {source} failed: {fetched.stderr.strip()}"
+            f"fetching its main from {source} failed: {fetched.stderr.strip()}"
         )
     return "FETCH_HEAD"
 

tests/test_audit_regressions.py

@@ -6660,7 +6660,8 @@ class SkipPacksHelpSaysWhatRuns(unittest.TestCase):
         )
         text = " ".join(proc.stdout.split())
         self.assertNotIn("Only regenerate DB and verify", text)
-        self.assertIn("Steps 7 and 8 still rewrite README.md and the site pages in website/", text)
+        self.assertIn("step 4e still rewrites install/games/, and steps 7 to 8b rewrite README.md "
+                      "and the site unless --skip-docs is given", text)
         self.assertNotIn("docs/", text)
 
     def test_every_step_it_names_is_one_it_skips(self):

tests/test_refresh_failures.py

@@ -130,7 +130,7 @@ class AForkPushedToItsOwnMain(unittest.TestCase):
             # A project that cannot be reached is an error, never "nothing".
             missing = self._changed(clone, str(Path(tmp, "absent")))
         self.assertNotEqual(missing.returncode, 0)
-        self.assertIn("fetching its main failed", missing.stderr)
+        self.assertIn("fetching its main from", missing.stderr)
 
 
 class RefreshFailuresAreFailures(unittest.TestCase):

tests/test_site_reference.py

@@ -422,7 +422,11 @@ class BuiltBatoceraPage(unittest.TestCase):
         # PlayStation's list is long enough to sit on a page of its own.
         pages = [main] + [p.read_text(encoding="utf-8") for p in
                           (DIST / "platforms").glob("batocera-sony-playstation*/index.html")]
-        html = "".join(pages)
+        # Read as a browser shows it: a page with no tab bar is plain
+        # Markdown, which keeps the entity a name's underscore is written as.
+        import html as _html
+
+        html = _html.unescape("".join(pages))
         for text in ("Served by:", "scph1001_v20.bin", "https://github.com/stenzek/duckstation/blob/"):
             with self.subTest(text=text):
                 self.assertTrue(text in html)