Added a comment

A comment was added to the binarySearchIterative.cpp so that I could
learn how to write good commit messages in git. This is being done
for learning the basics of git.
A stray comment added

More detailed expalantory text, if necessary. Wrap it to about
72 characters or so. In some contexts, the first line is
treated as the subject of an email and the rest of the text
as body

Furhter paragraphs come after blank lines.
  -Bullet points are okay
  -Typically a hyphen or asterisk is used