Fixed first reviewer comment - typo, fix sentence

doc/CHEP2016/CHEP_2016_paper_CTA.tex

@@ -214,7 +214,7 @@ to route EOS disk files to specific tape pools:
   \item Tape pool.
   \item Archive route.
 \end{itemize}
-An EOS user archives a file to tape by copying the file into to an EOS directory
+An EOS user archives a file to tape by copying the file into an EOS directory
 that has been tagged with a CTA storage class.  Within the EOS namespace a CTA
 storage class is simply a name.  For example the \texttt{raw\_data} storage
 class could be used to refer to user files that should have one copy on tape and