Add missing space to example doc (#6704)

GitOrigin-RevId: 2fd23a653d2913395da10b8d2d55029e73a0fede

services/web/app/templates/project_files/example-project/main.tex

@@ -5,7 +5,7 @@
 \usepackage[english]{babel}
 
 % Set page size and margins
-% Replace `letterpaper' with`a4paper' for UK/EU standard size
+% Replace `letterpaper' with `a4paper' for UK/EU standard size
 \usepackage[letterpaper,top=2cm,bottom=2cm,left=3cm,right=3cm,marginparwidth=1.75cm]{geometry}
 
 % Useful packages