chore(telegraf): "CONFIGURATION.md" link text should be "Configuration options"

Plugin pages contain:

```
[Global configuration options](http://localhost:1313/telegraf/v1/input-plugins/influxdb/#global-configuration-options)
Plugins support additional global and plugin configuration settings for tasks such as modifying metrics, tags, and fields, creating aliases, and configuring plugin ordering. See [CONFIGURATION.md](http://localhost:1313/telegraf/v1/configuration/#plugins) for more details.
```

But, "CONFIGURATION.md" is the Telegraf repo source file. In docs-v2, it's "Configuration options"

##### Relevant URLs
- /telegraf/v1/input-plugins/influxdb/

Search the docs-v2 Telegraf plugin pages for the exact [CONFIGURATION.md] link text, starting with /telegraf/v1/input-plugins/influxdb/. Update the displayed text to “Configuration options” while preserving the configuration URL, then verify the rendered plugin page no longer exposes the repository filename.

Written by the indexing model from the issue text.