Update CMakeLists.txt to fix typo

Author: mcbarton

unittests/CppInterOp/CMakeLists.txt

@@ -1,5 +1,5 @@
 if (EMSCRIPTEN)
-  # So we create a html file, as well as the javascript fil
+  # So we create a html file, as well as the javascript file
   set(CMAKE_EXECUTABLE_SUFFIX ".html")
   # Omitting CUDATest.cpp since Emscripten build currently has no GPU support
   # For Emscripten builds linking to gtest_main will not suffice for gtest to run