Merge pull request #27 from junjihashimoto/fix/typo

Fix typo of Puzzle 13

Author: austinvhuang

examples/gpu_puzzles/run.cpp

@@ -432,7 +432,7 @@ void puzzle12(Context &ctx) {
 }
 
 
-=// Puzzle 13 : Axis Sum
+// Puzzle 13 : Axis Sum
 // Implement a kernel that computes a sum over each column of a and stores it in out.
 
 const char *kPuzzle13 = R"(
@@ -536,4 +536,4 @@ int main(int argc, char **argv) {
   // puzzle13(ctx);
   // puzzle14(ctx);
   return 0;
-}
+}