Improve documentation of CUstream.getPtr (#765)

* Update doc

* nit: fix rendering

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Co-authored-by: Leo Fang <leo80042@gmail.com>

Author: vyasr

cuda_bindings/docs/source/tips_and_tricks.rst

@@ -9,7 +9,7 @@ Getting the address of underlying C objects from the low-level bindings
 
 All CUDA C types are exposed to Python as Python classes. For example, the :class:`~cuda.bindings.driver.CUstream` type is exposed as a class with methods :meth:`~cuda.bindings.driver.CUstream.getPtr()` and :meth:`~cuda.bindings.driver.CUstream.__int__()` implemented.
 
-There is an important distinction between the ``getPtr()`` method and the behaviour of ``__int__()``. If you need to get the pointer address *of* the underlying ``CUstream`` C object wrapped in the Python class, you can do so by calling ``int(instance_of_CUstream)``, which returns the address as a Python `int`, while calling ``instance_of_CUstream.getPtr()`` returns the pointer *to* the ``CUstream`` C object (that is, ``&CUstream``) as a Python `int`.
+There is an important distinction between the ``getPtr()`` method and the behaviour of ``__int__()``. Since a ``CUstream`` is itself just a pointer, calling ``instance_of_CUstream.getPtr()`` returns the pointer *to* the pointer, instead of the value of the ``CUstream`` C object that is the pointer to the underlying stream handle. ``int(instance_of_CUstream)`` returns the value of the ``CUstream`` converted to a Python int and is the actual address of the underlying handle.
 
 
 Lifetime management of the CUDA objects