Apply suggestions from code review

Co-authored-by: Heitor Tashiro Sergent <[email protected]>

Author: ankur22

docs/sources/k6/next/javascript-api/k6-browser/locator/last.md

@@ -5,7 +5,7 @@ description: 'Browser module: locator.last method'
 
 # last()
 
-Returns [Locator](https://grafana.com/docs/k6/<K6_VERSION>/javascript-api/k6-browser/locator/) to the last matching element.
+Returns a [Locator](https://grafana.com/docs/k6/<K6_VERSION>/javascript-api/k6-browser/locator/) to the last matching element.
 
 ### Returns
 

docs/sources/k6/next/javascript-api/k6-browser/locator/nth.md

@@ -5,7 +5,7 @@ description: 'Browser module: locator.nth method'
 
 # nth(number)
 
-Returns [Locator](https://grafana.com/docs/k6/<K6_VERSION>/javascript-api/k6-browser/locator/) to the n-th matching element. It's zero based, `nth(0)` selects the first element.
+Returns a [Locator](https://grafana.com/docs/k6/<K6_VERSION>/javascript-api/k6-browser/locator/) to the n-th matching element. The method is zero-based; for example, `nth(0)` selects the first element.
 
 ### Returns