* lib/e2mmap.rb: [DOC] Fix typo in e2mmap documentation.

Patch by Xavier Shay. Closes GH-438.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/e2mmap.rb

@@ -22,7 +22,7 @@
 # 2.
 #   module Error
 #     extend Exception2MessageMapper
-#     def_e2meggage ExistingExceptionClass, "message..."
+#     def_e2message ExistingExceptionClass, "message..."
 #     def_exception :NewExceptionClass, "message..."[, superclass]
 #     ...
 #   end