Update installation.tex

Author: vikramgavini

doc/manual/installation.tex

@@ -189,7 +189,7 @@ \subsubsection{Instructions for deal.II}
 \end{verbatim}
 ``Success'', means deal.II was able to use the corresponding vector instructions, and ``Failed'' would mean otherwise. If deal.II is not able to pick an available vector instruction on your high-performance computer, please contact the deal.II developers at \href{https://groups.google.com/d/forum/dealii}{deal.II mailing lists} and/or contact your high-performance computer support for guidance on how to use the correct compiler flags for AVX or AVX-512. 
 
-Ensure that deal.II picks up AVX-512 and is strongly recommended for obtaining maximum performance on the new Intel Xeon Phi (KNL) and Skylake processors, both of which support Intel AVX-512 instructions.
+Ensure that deal.II picks up AVX-512, which is strongly recommended for obtaining maximum performance on the new Intel Xeon Phi (KNL) and Skylake processors, both of which support Intel AVX-512 instructions.
 
 \subsubsection{Important generic instructions for deal.II and its dependencies}
 \begin{itemize}