Replace all use of `wget` with `curl`

_Describe your proposal here._

The `curl` tool has a much wider distribution than the `wget` command. This means users are much less likely to need to install a command like `wget` before being able to continue with downloading and installing the software.

To remove this unnecessary impediment, I propose switching all use of `wget ...` to `curl -o ...` throughout the documentation.

##### Relevant URLs
- https://docs.influxdata.com/enterprise_influxdb/v1.10/introduction/installation/meta_node_installation/

Start by searching the documentation repository for every `wget` occurrence, including the linked Meta Node Installation page. Replace the documented commands with the proposed `curl -o` form, then repeat the search to confirm no documented uses of `wget` remain.

Written by the indexing model from the issue text.