Escape @ to avoid generation of a link

Author: afabri

Point_set_processing_3/doc/Point_set_processing_3/Point_set_processing_3.txt

@@ -753,7 +753,7 @@ A parallel version of WLOP is provided and requires the executable to be linked
 <a href="https://github.com/oneapi-src/oneTBB">Intel TBB library</a>.
 To control the number of threads used, the user may use the tbb::task_scheduler_init class.
 See the <a href="https://software.intel.com/content/www/us/en/develop/documentation/onetbb-documentation/top.html">TBB documentation</a>
-for more details. We provide below a speed-up chart generated using the parallel version of the WLOP algorithm. The machine used is a PC running Windows 7 64-bits with a 4-core [email protected] CPU with 8GB of RAM.
+for more details. We provide below a speed-up chart generated using the parallel version of the WLOP algorithm. The machine used is a PC running Windows 7 64-bits with a 4-core i7-4700HQ\@2.40GHz CPU with 8GB of RAM.
 
 \cgalFigureBegin{Point_set_processing_3figWLOP_parallel_performance, parallel_WLOP_performance.jpg}
 Parallel WLOP speed-up, compared to the sequential version of the algorithm.
@@ -828,13 +828,14 @@ The following example reads a set of points with normals and smooths them via bi
 Comparison for two smoothing methods: Left: Input, 250K points, normal-color mapping. Middle: Jet smoothing result, 197 seconds. Right: Bilateral smoothing result, 110 seconds.
 \cgalFigureEnd
 
-\subsubsection Point_set_processing_3Bilateral_smoothing_parallel_performance Parallel
+\subsubsection Point_set_processing_3Bilateral_smoothing_parallel_performance Parallel Performance
 
-Performance:
 A parallel version of bilateral smoothing is provided and requires the executable to be linked against the
 <a href="https://github.com/oneapi-src/oneTBB">Intel TBB library</a>.
 The number of threads used is controlled through the tbb::task_scheduler_init class.
-See the <a href="https://software.intel.com/content/www/us/en/develop/documentation/onetbb-documentation/top.html">TBB documentation</a> for more details. We provide below a speed-up chart generated using the parallel version of the bilateral smoothing algorithm. The machine used is a PC running Windows 7 64-bits with a 4-core [email protected] CPU with 8GB of RAM.
+See the <a href="https://software.intel.com/content/www/us/en/develop/documentation/onetbb-documentation/top.html">TBB documentation</a> for more details.
+We provide below a speed-up chart generated using the parallel version of the bilateral smoothing algorithm.
+The machine used is a PC running Windows 7 64-bits with a 4-core i7-4700HQ\@2.40GHz CPU with 8GB of RAM.
 
 \cgalFigureBegin{Point_set_processing_3Bilateral_smoothing_parallel_performance, parallel_bilateral_smooth_point_set_performance.jpg}
 Parallel bilateral smoothing speed-up, compared to the sequential version of the algorithm.