Fix typo in function name in tutorial. The name was already used in a previous example.
Fix typo in function name in tutorial. The name was already used
in a previous example.


Former-commit-id: 1827c5665064d5bd859e5b93e294378775ff551e
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide