G224: fix two typos and a broken link (#4512)

Closes #4511

sizies → sizes
modigy → modify
removed the `.html` from the reflow indenting link

Co-authored-by: Mike Gower <[email protected]>

Author: fstrr

techniques/general/G224.html

@@ -124,7 +124,7 @@ <h2>Examples</h2>
 	&lt;/body>
 &lt;/html>
 </pre>     
-        <p>The indentation of code blocks like these could be adjusted at different viewport sizies, via a CSS Media Query.</p>
+        <p>The indentation of code blocks like these could be adjusted at different viewport sizes, via a CSS Media Query.</p>
 <pre>
 @media screen and ( min-width: 320px ) {
 	pre {
@@ -144,7 +144,7 @@ <h2>Examples</h2>
 	}
 }
 </pre>
-        <p>A working example of <a href="../../working-examples/reflow-indenting.html">code snippets using CSS to modigy indentation width at different breakpoints</a>.
+        <p>A working example of <a href="../../working-examples/reflow-indenting">code snippets using CSS to modify indentation width at different breakpoints</a>.
         </section>
     </section>