Update historical PMD version in docs

Author: slawekjaranowski

src/site/apt/examples/upgrading-PMD-at-runtime.apt.vm

@@ -88,6 +88,8 @@ Upgrading PMD at Runtime
 *--------------------------------------------------------------------------------*-----------------------------------------------------*
 | <<maven-pmd-plugin>>                                                           | <<PMD>>                                             |
 *--------------------------------------------------------------------------------*-----------------------------------------------------*
+| {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.28.0/}3.28.0}} | {{{https://docs.pmd-code.org/pmd-doc-7.17.0/}7.17.0}} |
+*--------------------------------------------------------------------------------*-----------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.27.0/}3.27.0}} | {{{https://docs.pmd-code.org/pmd-doc-7.14.0/}7.14.0}} |
 *--------------------------------------------------------------------------------*-----------------------------------------------------*
 | {{{https://maven.apache.org/plugins-archives/maven-pmd-plugin-3.26.0/}3.26.0}} | {{{https://docs.pmd-code.org/pmd-doc-7.7.0/}7.7.0}} |