docs(overview): Fix SmartWatts reports unit

Author: Inkedstinct

docs/reference/overview.md

@@ -14,7 +14,7 @@ The diagram below illustrates the overall architecture of a PowerMeter within th
 A PowerMeter consists of two essential components:   
 
 - a [Sensor](#Sensor), which collects system usage metrics and generates usage reports.  
-- a [Formula](#Formula), which applies a computational model to the usage reports, producing power consumption data (in mJ).
+- a [Formula](#Formula), which applies a computational model to the usage reports, producing power consumption data (in watts).
 
 Additionally, [Preprocessors](./overview.md#Preprocessors) can be utilized to modify usage reports before they are processed by the Formula.