doc: desc. in man how to init Modules in Ruby script

Fixes #535

.hunspell.en.dic

@@ -1169,3 +1169,4 @@ codename
 EVENTLIST
 logfd
 OpenSuse
+ENVModule

NEWS.rst

@@ -95,6 +95,8 @@ Modules 5.5.0 (not yet released)
 * Tag automatically loaded module ``auto-loaded`` prior evaluation to be able
   to query this state during modulefile evaluation with :mfcmd:`module-info
   tags<module-info>`.
+* Doc: describe in :ref:`module(1)` man page how to initialize Modules in a
+  Ruby script. (fix issue #535)
 
 .. warning:: Variant names are now fully checked instead of just verifying
    their first character. Only characters within the ``A-Za-z0-9_-`` range are

doc/source/module.rst

@@ -125,6 +125,13 @@ Python:
      exec(open("\ |initdir|\ /python.py").read(), globals())
      module("load", "modulefile", "modulefile", "...")
 
+Ruby:
+
+.. parsed-literal::
+
+     require '\ |initdir|\ /ruby.rb'
+     ENVModule.module('load', 'modulefile', 'modulefile', '...')
+
 Bourne Shell (sh) (and derivatives) with :subcmd:`autoinit` sub-command:
 
 .. parsed-literal::