update acknowledgements

Author: gubsheep

src/intro.tex

@@ -171,7 +171,7 @@ \section{Acknowledgements}
 This book was made possible with the help of members of the 0xPARC community.
 
 We would like to thank Brandon Wang, Janabel Xia, and Claire Zhang for
-contributions to an early set of notes that evolved into this book;
-and Caroline Ballegaard, Sebastian Clark, Holden Mui, Arturo Rojas,
-and Mihir Singhal for assistance with typesetting, printing, and producing
-this edition.
+contributions to an early set of notes that evolved into this book; Alex
+Allain for many comments and corrections; and Caroline Ballegaard, Sebastian
+Clark, Holden Mui, Arturo Rojas, and Mihir Singhal for assistance with
+typesetting, printing, and producing this edition.