Update ch-projects.ptx (#38)

Author: StevenClontz

source/ch-projects.ptx

@@ -7,7 +7,7 @@
 <url href="https://pretextbook.org/">PreTeXt</url>
 is an authoring and publishing system for 
 scholarly documents, especially in STEM disciplines.
-Worked authored in PreTeXt can be converted to HTML,
+Works authored in PreTeXt can be converted to HTML,
 PDF, braille, and many other formats. This book was
 written in PreTeXt!
         </p>
@@ -100,4 +100,4 @@ You can engage with this group by visiting their homepage at
 <url href="https://prose.runestone.academy"/>.
         </p>
     </section> 
-</chapter>
+</chapter>