Add "OpenTelemetry" to default `doc_valid_idents`

The OpenTelemetry project's name is all one word (see https://opentelemetry.io),
so currently triggers a false positive in the `doc_markdown` lint.

The project is increasing rapidly in popularity, so it seems like a worthy
contender for inclusion in the default `doc_valid_idents` configuration.

I've also moved the existing "OpenDNS" entry earlier in the list, to restore
the alphabetical ordering of that "Open*" row.

The docs changes were generated using `cargo collect-metadata`.

changelog: [`doc_markdown`]: Add `OpenTelemetry` to the default configuration as an allowed identifier

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