Remove the doc changes docdoc_changes

We're not using these anymore

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-<!---
-This file is reset every time a new release is done. This file describes changes that have not yet been released.
-
-Example Doc Change:
-### Headline for the required change
-Description of the required change.
--->
-
-# Ohai Doc Changes:
-
-## Shard Seed Plugin
-
-The new `shard_seed` attribute provides a uniformly distributed integer ID value
-to all nodes. This value will be between 0 and 4294967295 (0xFFFFFFFF), based
-on a consistent hash of one or more pieces of node data. A consistent hash
-means that a node with the same source inputs will always result in the same
-shard seed, but collisions are possible.
-
-The sources used to compute the seed value can be configured either in your
-Chef config file:
-
-```ruby
-Ohai::Config[:plugin][:shard_seed][:sources] = [:fqdn]
-```
-
-or your Ohai config file if you run Ohai outside of Chef:
-
-```ruby
-ohai.plugin[:shard_seed][:sources] = [:fqdn]
-```
-
-The default sources are `[:machinename, :serial, :uuid]` but this value should
-be considered experimental for the moment as it may be expanded to support
-additional platforms. Configuring a value that works for your infrastructure is
-highly recommended.
-
-### Shard Seed Sources
-
-There are multiple sources of data that can be used as inputs to the hash:
-
-* `:machinename` – Everything before the first `.` in the machine's hostname.
-* `:fqdn` – The machine's fully-qualified name. Depending on your platform and
-  configuration, it is possible that this value could be unstable during DNS
-  failures or other network outages.
-* `:hostname` – The machine's raw hostname. As with `:fqdn`, this may be unstable
-  during DNS failures or network outages.
-* `:serial` – The machine's serial number as reported by DMI, SystemProfiler, or
-  WMI.
-* `:uuid` – The machine's UUID as reported by DMI, SystemProfiler, or WMI.
-* `:machine_id` – The systemd machine ID. Only available on platforms using
-  systemd.
-
-You can configure either one source or an array of sources which will be
-concatenated together.
-
-### Using the Shard Seed
-
-Two main use cases for the seed value are slow rollouts of new features and
-computing service IDs.
-
-To do slow rollouts, you can wrap new features or options in your recipe code
-with a conditional `if` statement like:
-
-```ruby
-# Enable feature for 20% of nodes.
-if (node['shard_seed'] % 100) < 20
-  # Code goes here ...
-end
-```
-
-For creating a service ID for something like ZooKeeper or MySQL replication:
-
-```ruby
-# Write the ID to a file for safety, in case something changes.
-file '/etc/zookeeper/myid' do
-  action :create_if_missing
-  # ZooKeeper ID is 1-255.
-  content "#{(node['shard_seed'] % 255) + 1}"
-end
-```
-