Update index.njk

Author: SimonPadbury

src/index.njk

@@ -62,7 +62,7 @@
       <h2 class="h4 mt-1 t-bold t-balance">Typography</h2>
       <ul>
         <li>Serif, sans-serif, and monospaced font stacks</li>
-        <li>Font weights: lighter, normal, semi-bold, bold, heavy</li>
+        <li>Font weights: thin, normal, semibold, bold, heavy</li>
         <li>Heading size also as utility classes</li>
         <li>Large display text for headings and landing pages</li>
         <li>Comfortable long-read font sizes controlled by CSS clamp</li>
@@ -171,4 +171,4 @@
 
 {% include "site-footer.njk" %}
 
-{% include "_html-foot.njk" %}
+{% include "_html-foot.njk" %}