add ASSOCIATED_TARGETS to function signature in rapids_cython_create_…

…modules() docs (#670)

`rapids_cython_create_modules()` accepts an argument `ASSOCIATED_TARGETS` which is missing from the function signature in its docs.

This fixes that.

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #670

rapids-cmake/cython-core/create_modules.cmake

@@ -28,7 +28,8 @@ Generate C(++) from Cython and create Python modules.
                                [SOURCE_FILES <src1> <src2> ...]
                                [LINKED_LIBRARIES <lib1> <lib2> ... ]
                                [INSTALL_DIR <install_path>]
-                               [MODULE_PREFIX <module_prefix>])
+                               [MODULE_PREFIX <module_prefix>]
+                               [ASSOCIATED_TARGETS <target1> <target2> ...])
 
 Creates a Cython target for each provided source file, then adds a
 corresponding Python extension module. Each built library has its RPATH set to