chore(docs): Added a couple of words to tutorial (#17876)

In this paragraph:

"Take the example of creating a custom button. In the past, you would create a CSS class (perhaps .primary-button) with your custom styles and then whenever you want to apply those styles e.g."

It doesn't read clearly - "and then whenever you want to apply those styles e.g"

Have added a couple of words for clarity, and changed "e.g." to "for example" (Latinate abbreviations aren't very friendly to people with English as a second language, and raise the reading level required for native speakers as well)

docs/tutorial/part-one/index.md

@@ -131,7 +131,7 @@ One of the big mental shifts you make when starting to build with components (if
 
 While a seemingly simple change, this has profound implications for how you think about building websites.
 
-Take the example of creating a custom button. In the past, you would create a CSS class (perhaps `.primary-button`) with your custom styles and then whenever you want to apply those styles e.g.
+Take the example of creating a custom button. In the past, you would create a CSS class (perhaps `.primary-button`) with your custom styles and then use it whenever you want to apply those styles. For example:
 
 ```html
 <button class="primary-button">Click me</button>