Update release notes

git-svn-id: http://root.cern.ch/svn/root/trunk@31957 27541ba8-7e3a-0410-8455-c3a389f83636

montecarlo/doc/v528/index.html

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 <h3>MonteCarlo</h3>
+<h4>TDatabasePDG</h4>
+The method ReadPDGTable of TDatabasePDG was setting the stable flags for 
+all particles regardless of their width.
+
+<h4>TParticlePDG</h4>
+The value reported in the fLifetime variable of TParticlePDG is in seconds
+while in the documentation is was indicated in nanoseconds.
+
+<h4>pdg_table.txt</h4>
+Particles with a width greater than 1e-10 have now the stable flag set to 1.
+
+
+