* doc/syntax/miscellaneous.rdoc:  Added documentation for alias, undef,
  BEGIN, END.
* doc/syntax/modules_and_classes.rdoc (Constants):  Fixed unwrapped
  paragraph with trailing whitespace.
* doc/syntax/modules_and_classes.rdoc (Scope):  Added section pointing
  to alias and undef documentation.
* doc/syntax.rdoc:  Added link to miscellaneous section.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38853 b2dd03c8-39d4-4d8f-98ff-823fe69b080e