Documentation: fix C++ South plugin signatures involving PLUGIN_HANDLE #1195
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Fix the issue #1069
In the 'plugin_developers_guide/03_south_C_plugins.html' documentation page, the signature of some plugin functions involving PLUGIN_HANDLE is erroneous.
According to the definitions of the function pointers about the South plugins ($FLEDGE_ROOT/C/services/south/include/south_plugin.h), fix these signatures.
And use the appropriate C++ 'cast' operator,
more restrictive and accurate 'cast' operator than the C one, for the 'PLUGIN_HANDLE' object.