RUBY-2884 Add Mongoid FAQ page (#5208)

* RUBY-2884 add mongoid faqs

* RUBY-2884 add tildes

* RUBY-2888 update language

* RUBY-2884 add issue from the move around issues

* RUBY-2884 change language

* RUBy-2884 change file name

* RUBY-2884 move issues to driver

Author: neilshweky

source/tutorials.txt

@@ -12,3 +12,4 @@ Tutorials
   tutorials/getting-started-sinatra
   tutorials/getting-started-rails
   tutorials/documents
+  tutorials/common-errors

source/tutorials/common-errors.txt

@@ -0,0 +1,49 @@
+*************
+Common Errors
+*************
+
+.. default-domain:: mongodb
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+Mongoid/Moped Authentication Error: failed with error 13
+========================================================
+
+If you are encountering the following error:
+
+.. code-block:: ruby
+
+  Moped::Errors::OperationFailure: The operation: #<Moped::Protocol::Command
+    @length=83
+    @request_id=5
+    @response_to=0
+    @op_code=2004
+    @flags=[]
+    @full_collection_name="mongose_development.$cmd"
+    @skip=0
+    @limit=-1
+    @selector={:getlasterror=>1, :w=>1}
+    @fields=nil>
+  failed with error 13: "not authorized for insert on mongose_development.people"
+
+  See https://github.com/mongodb/mongo/blob/master/docs/errors.md
+  for details about this error.
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/operation/read.rb:50:in `block in execute'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/node.rb:594:in `[]'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/node.rb:594:in `block (2 levels) in flush'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/node.rb:593:in `map'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/node.rb:593:in `block in flush'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/bundler/gems/moped-10abbf3eac37/lib/moped/node.rb:617:in `block in logging'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0/lib/active_support/notifications.rb:164:in `block in instrument'
+    from /.rbenv/versions/2.1.4/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0/lib/active_support/notifications/instrumenter.rb:20:in `instrumen
+
+This error is caused by Moped, a Ruby driver that is no longer in use by
+Mongoid. Upgrading to Mongoid 5+ should fix this issue.
+
+You can find more information about this issue here:
+`MONGOID-4067 <https://jira.mongodb.org/browse/MONGOID-4067>`_.
+