correct error on 3d rakefile

Author: monkstone

samples/processing_app/library/vecmath/vec3d/Rakefile

@@ -17,7 +17,7 @@ def samples_list
 end
 
 def run_sample(sample_name)
-  format('Running %s...quit to run next sample', sample_name
+  format('Running %s...quit to run next sample', sample_name)
   open("|rp5 run #{sample_name}", 'r') do |io|
     while l = io.gets
       puts(l.chop)