Add missing word to first exercise (#79)

I matched the tense of the surrounding phrases.

Author: kishba

exercises/01.styling/01.problem.public-links/README.mdx

@@ -6,7 +6,7 @@
 awesome favicon for our site in the `public` directory. Browsers will request
 the `/favicon.ico` by default, but we've got a
 ✨ responsive ✨ <InlineFile file="public/favicon.svg" /> that will look good in
-light and dark mode (you find a media query embedded in the SVG itself). Let's
+light and dark mode (you will find a media query embedded in the SVG itself). Let's
 get that on the page.
 
 To do this, we'll need to add a `<link>` to <InlineFile file="app/root.tsx" />.