Document full version number with policy default

In CMake Policy documentation we specify the default behavior for the
current version of CMake.  This commit fixes that version by reporting
the full version number instead of just major and minor.

Source/cmPolicies.cxx

@@ -679,8 +679,7 @@ void cmPolicies::GetDocumentation(std::vector<cmDocumentationEntry>& v)
     if(i->first != cmPolicies::CMP0000)
       {
       full << "  "
-           << "CMake version " << cmVersion::GetMajorVersion()
-           << "." << cmVersion::GetMinorVersion() << " ";
+           << "CMake version " << cmVersion::GetCMakeVersion() << " ";
       // add in some more text here based on status
       switch (i->second->Status)
         {