doc: Re-organize and improve Java Interface documentation. * doc/interpreter/java.txi: Add usejava, isjava functions, debug_java, java_matrix_autoconversion, java_unsigned_autoconversion to docs. Re-organize to put functions in logical order. Add new "Dialog Box Functions" node. * doc/interpreter/system.txi: Remove usejava from list of system functions. * libinterp/octave-value/ov-java.cc(FjavaObject, FjavaMethod, Fjava_unsigned_autoconversion): Improve docstrings. * scripts/java/javaArray.m: Tweak docstring. * scripts/java/listdlg.m: Wrap long lines in docstring. Improve code example in docstring.

--- a/scripts/java/listdlg.m
+++ b/scripts/java/listdlg.m
@@ -64,10 +64,10 @@
 ##
 ## @example
 ## @group
-## [sel, ok] = listdlg ("ListString", @{"An item", "another", "yet another"@}, "SelectionMode", "Multiple" );
+## [sel, ok] = listdlg ("ListString", @{"An item", "another", "yet another"@},
+##                      "SelectionMode", "Multiple");
 ## if (ok == 1)
-##   imax = numel (sel);
-##   for i = 1:1:imax
+##   for i = 1:numel (sel)
 ##     disp (sel(i));
 ##   endfor
 ## endif