Update cpp-processing-unit.markdown
Update cpp-processing-unit.markdown

fixed the code example , some polishing
barakb/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,barakb/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll,yohanakh/gigaspaces-wiki-jekyll,kemiz/gigaspaces-wiki-jekyll