Fixes #18

Author: cmontella

src/handbook/aggregates.md

@@ -17,13 +17,13 @@ Aggregates are functions that take an input set and produce an output set, typic
 Aggregates are called just like other functions in Eve. For instance, the `count` aggregate is called like so:
 
 ```eve
-employee-count = count[value: employees]
+employee-count = count[given: employees]
 ```
 
 Aggregates don't always produce a single output value. In some instances, you may want to group your input according to a desired dimension (department, grade, state, country, zip code, etc.) and then aggregate based on those groupings. Extending the example above, we could count the employees in each department:
 
 ```eve
-employee-count = count[value: employees, per: department]
+employee-count = count[given: employees, per: department]
 ```
 
 Now, `employee-count` will have a count for each department, instead of a single count over all departments. For more complete examples, see the doc files for specific aggregates.