Junjie Mao 97eb72a4a0 doc: always use 'None' for functions not returning a value ...

It is preferred to state the absence of a return value explicitly in the
doxygen-stile comments. Currently there are different styles of doing this,
including:

  @return None
  @return NULL
  @return void
  @return N/A

This patch unifies the above with `@return None`.

Tracked-On: #1595
Signed-off-by: Junjie Mao <junjie.mao@intel.com>

2018-11-30 14:55:17 +08:00

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