typo on the spec generation

src/spec/create_extension_spec.py

@@ -67,7 +67,7 @@ def main():
         name="condition_labels",
         doc=(
             "The labels of the conditions that the data is aligned to. The size of this array should match "
-            "the number of conditions. This is only used when the data is aligned to multiple conditions."
+            "the number of conditions. This is only used when the data is aligned to multiple conditions. "
             "First condition is index 0, second is index 1, etc."
         ),
         dtype="text",