wording changes - minor

Author: nhu-do-1

articles/machine-learning/concept-sourcing-human-data.md

@@ -121,11 +121,11 @@ We suggest the following best practices for manually collecting human data direc
 
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-        **Communicate expectations clearly in the Statement of Work (SOW) with suppliers.**
+        **Communicate expectations clearly in the Statement of Work (SOW) (contracts or agreements) with suppliers.**
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-        - An SOW which lacks requirements for responsible data collection work may result in low-quality or poorly collected data.     
+        - A contract which lacks requirements for responsible data collection work may result in low-quality or poorly collected data.     
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