ruff: Fix a very small typo in comment (#33592)

diff --git a/ruff.toml b/ruff.toml
index fec7608..a33a97e 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -15,5 +15,5 @@
 [lint]
 select = ["E4", "E7", "E9", "F"]
 ignore = [
-    "E721" # We use is for good reasons
+    "E721" # We use it for good reasons
 ]