Update src/derivatives/imaging.md

Co-authored-by: Robert Smith <[email protected]>

src/derivatives/imaging.md

@@ -154,7 +154,7 @@ Template:
 A binary (1 - inside, 0 - outside) mask in the space defined by the [`space` entity](../appendices/entities.md#space).
 If no transformation has taken place, the value of `space` SHOULD be set to `orig`.
 If the mask is an ROI mask derived from an atlas segmentation,
-then the [`label` entity](../appendices/entities.md#label)) SHOULD be used to specify the masked structure
+then the [`label` entity](../appendices/entities.md#label) SHOULD be used to specify the masked structure
 (see [Common image-derived labels](#common-image-derived-labels)).
 
 JSON metadata fields: