Update article.md

Author: weswhite

2-ui/1-document/03-dom-navigation/article.md

@@ -155,9 +155,9 @@ The first thing is nice. The second is tolerable, because we can use `Array.from
 ```warn header="DOM collections are read-only"
 DOM collections, and even more -- *all* navigation properties listed in this chapter are read-only.
 
-We can't replace a child by something else assigning `childNodes[i] = ...`.
+We can't replace a child by something else by assigning `childNodes[i] = ...`.
 
-Changing DOM needs other methods, we'll see them in the next chapter.
+Changing DOM needs other methods. We will see them in the next chapter.
 ```
 
 ```warn header="DOM collections are live"
@@ -309,7 +309,7 @@ An example of usage:
 
 The specification: [tabular data](https://html.spec.whatwg.org/multipage/tables.html).
 
-There are also additional navigation properties for HTML forms. We'll look at them later when start working with forms.
+There are also additional navigation properties for HTML forms. We'll look at them later when we start working with forms.
 
 # Summary