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doc: mention close_cb can be NULL (#3810)

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docs/src/handle.rst
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@ -153,6 +153,9 @@ API
In-progress requests, like uv_connect_t or uv_write_t, are cancelled and In-progress requests, like uv_connect_t or uv_write_t, are cancelled and
have their callbacks called asynchronously with status=UV_ECANCELED. have their callbacks called asynchronously with status=UV_ECANCELED.
`close_cb` can be `NULL` in cases where no cleanup or deallocation is
necessary.
.. c:function:: void uv_ref(uv_handle_t* handle) .. c:function:: void uv_ref(uv_handle_t* handle)
Reference the given handle. References are idempotent, that is, if a handle Reference the given handle. References are idempotent, that is, if a handle