Cleanup: Grammar in comments: Fix uses of "own"

"Own" (the adjective) cannot be used on its own. It should be combined
with something like "its own", "our own",  "her own", or "the object's own".
It also isn't used separately to mean something like "separate".

Also, "its own" is correct instead of "it's own" which is a misues of the verb.

build_files/build_environment/CMakeLists.txt

@@ -117,7 +117,7 @@ endif()
 # Embree needs to be included after dpcpp as it uses it for compiling with GPU support
 if(BLENDER_PLATFORM_WINDOWS_ARM)
   # WoA needs embree to be built with the VS Generator + LLVM,
-  # put it in it's own file to avoid clutter.
+  # put it in its own file to avoid clutter.
   include(cmake/embree_windows_arm.cmake)
 else()
   include(cmake/embree.cmake)