[make_site.h] added C++ client API documentaion
[make_site.h] added C++ client API documentaion

The C++ client API documentation is auto-generated by doxygen.
The top-level file is 'index.html' file in the 'cpp_client_api'
sub-directory of the site contents.

Change-Id: I9347f515ed4e1e0e3a5d46c969e57fe4983f17e2
Reviewed-on: http://gerrit.cloudera.org:8080/3729
Reviewed-by: Mike Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@apache.org>
Tested-by: Mike Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@apache.org>

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