Updating java/concepts/booleans/about.md (#2042)
Updating java/concepts/booleans/about.md (#2042)

* Updating java/concepts/booleans/about.md

Added some more examples explained the operators a little

* Update concepts/booleans/about.md

Co-authored-by: Jason Runkle <0110b1b4ade66030eef8c489b2eefb88af5ee5ca@gmail.com>

Co-authored-by: Jason Runkle <0110b1b4ade66030eef8c489b2eefb88af5ee5ca@gmail.com>
jmluy/xjava,jmluy/xjava