corrected grammer errors on webpage

developer-guide.html

@@ -152,23 +152,23 @@ <h3>Building large- or small-strain EVPFFT inside Anaconda</h3>
                     the number of cores on the CPU for fast compulation times.  
                 </p> 
                 <p>                    
-                    To compile the code with the the serial Kokkos backend, which means only MPI, type:
+                    To compile the code with the serial Kokkos backend, which means only MPI, type:
                     <pre><code> source build_evpfft.sh --heffte_build_type=fftw --kokkos_build_type=serial </code></pre>  
                 </p> 
                 <p style="margin : 0; padding-top:0;">  
                     Congratulations, the code is compiled.  The executable is located in:
                     <pre><code> Fierro/src/EVPFFT/evpfft_fftw_serial </code></pre>
                 </p> 
                 <p>     
-                    To compile the code with the the openMP Kokkos backend, which means MPI plus openMP, type:
+                    To compile the code with the openMP Kokkos backend, which means MPI plus openMP, type:
                     <pre><code> source build_evpfft.sh --heffte_build_type=fftw --kokkos_build_type=openmp </code></pre>  
                 </p> 
                 <p style="margin : 0; padding-top:0;">  
                     The executable is located in:
                     <pre><code> Fierro/src/EVPFFT/evpfft_cufftw_openmp </code></pre>
                 </p> 
                 <p>     
-                    To compile the code with the the CUDA Kokkos backend, which means MPI plus CUDA, type:
+                    To compile the code with the CUDA Kokkos backend, which means MPI plus CUDA, type:
                     <pre><code> source build_evpfft.sh --heffte_build_type=cufft --kokkos_build_type=cuda </code></pre>  
                 </p> 
                 <p style="margin : 0; padding-top:0;">