Fixing typo for Phalcon Developer tools

Hi Team Phalcon,

I have been developing some of my project using Phalcon.
And I think the framework is great and very interesting to me.

So today, I found the typo in the tools.rst file.
Actually it was only one word but it is so important, I think.

If we write current "config.ini", "phalcon migration generate" command doesn't work properly. I have just tried it.

So it would be great if you could make sure what I reviewed.
Thanks