ruff: Fix ISC003 Explicitly concatenated string.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py

@@ -45,8 +45,10 @@ VNU_IGNORE = [
     r"The first occurrence of ID “[^”]*” was here\.",
     r"Attribute “markdown” not allowed on element “div” at this point\.",
     r"No “p” element in scope but a “p” end tag seen\.",
-    r"Element “div” not allowed as child of element “ul” in this context\. "
-    + r"\(Suppressing further errors from this subtree\.\)",
+    (
+        r"Element “div” not allowed as child of element “ul” in this context\."
+        r" \(Suppressing further errors from this subtree\.\)"
+    ),
     # Opinionated informational messages.
     r"Self-closing tag syntax in text/html documents is widely discouraged; it’s unnecessary and interacts badly with other HTML features \(e\.g\., unquoted attribute values\)\. If you’re using a tool that injects self-closing tag syntax into all void elements, without any option to prevent it from doing so, then consider switching to a different tool\.",
 ]