Commit 9333fad added JSON formatted examples for all ACL polices.
Most of these these examples are not valid JSON, and thus an error is
raised when attempting to create the example policies/rules in Consul.
This commit fixes the example JSON formatted ACL rules so that they
are valid JSON. This enables readers to use the policies as-is from
the documentation to successfully create policies in Consul.
It also removes unnecessary arrays from the example policies so that
the policies are easier for practitioners to read and write.
Remove empty CodeBlockConfig elements. These elements are not
providing any benefit for the enclosed code blocks. This PR removes
the elements so so that the source is easier to read.
