When main field name had whitespace, script incorrectly split it
into two separate words, for example when used with
"Mega feature" it treats it as two words: "Mega" and "feature".
This is not what we want it so fix it, also use "Mega feature"
in main call.

Also while at this, add additional verification step that
conflicting words are consistent and improve example of usage.

Cc: Katarzyna Piecielska <katarzyna.piecielska@intel.com>
Signed-off-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Katarzyna Piecielska <katarzyna.piecielska@intel.com>