[LANG-1511] SystemUtils is missing important documentation

Author: garydgregory

src/changes/changes.xml

@@ -64,6 +64,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action                   type="fix" dev="ggregory" due-to="Gary Gregory">Fix NullPointerException in FastDateParser.TimeZoneStrategy.setCalendar(FastDateParser, Calendar, String) on Java 23.</action>
     <action issue="LANG-1757" type="fix" dev="ggregory" due-to="Gary Gregory">Fix NullPointerException in MethodUtils.getMatchingAccessibleMethod((Class, String, Class...)).</action>
     <action issue="LANG-1698" type="fix" dev="ggregory" due-to="Jan Arne Sparka, Gary Gregory">Fix StackOverflowError in TypeUtils.typeVariableToString(TypeVariable), TypeUtils.toString(Type) on Java 17 and up.</action>
+    <action issue="LANG-1511" type="fix" dev="ggregory" due-to="david cogen, Gary Gregory, Bruno P. Kinoshita">SystemUtils is missing important documentation.</action>
     <!-- ADD -->
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add Strings and refactor StringUtils.</action>
     <action issue="LANG-1747" type="add" dev="ggregory" due-to="Oliver B. Fischer, Gary Gregory">Add StopWatch.run([Failable]Runnable) and get([Failable]Supplier).</action>