Update Apache Pig documentation (0.16.0, 0.15.0, 0.14.0, 0.13.0)
Update Apache Pig documentation (0.16.0, 0.15.0, 0.14.0, 0.13.0)

rlugojr/devdocs,webcoding/devdocs,rlugojr/devdocs,yosiat/devdocs,rlugojr/devdocs,webcoding/devdocs,webcoding/devdocs,yosiat/devdocs,yosiat/devdocs