fixed some minor typos

I thought that I had, could I sit with you to see if i’m not correctly pushing the changes up to github?
> On Dec 15, 2014, at 4:16 PM, Andreas M. Kavountzis <notifications@github.com> wrote:
> 
> In write_ups/describe_these_code_examples.md <https://github.com/gSchool/ruby-intro-to-enumerable-part-a/pull/25#discussion-diff-21865926>:
> 
> >  ```
> >  
> > -**Response:** 
> > +**Response:**
> You never pushed your answers! If you do please contact me directly.
> 
> —
> Reply to this email directly or view it on GitHub <https://github.com/gSchool/ruby-intro-to-enumerable-part-a/pull/25/files#r21865926>.
>