Improved Documentation

__Changes__:

* Some sentences in the docstrings have been restructured to be more intuitive to users.
* Typos have also been fixed.

__Proposals__:

* We may require to have a documentation guideline that guides how documentation in the module is preferred and be adhered to.
* I recommend the following guide for your consideration: http://docs.python-guide.org/en/latest/writing/documentation/

_If there is more to do, please do suggest._
I would go further to state:

__delete__:  marks table rows for deletion.
__truncate__: removes the entire contents of a table, while leaving the table and related indexes intact.

For more information: http://dev.mysql.com/doc/refman/5.6/en/glossary.html#glos_delete

_What do you think?_