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Documentation/configuration example: corrects the used keyword to match section in example.

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#### What is this PR doing: Add missing character to an example configuration. The name provided in the example list should match the following section. The keyword publishd was missing...

https://github.com/elastic/logstash/blob/f1823d8fac35b62b33a95392c80c49f6659d4f09/docs/reference/configuration-file-structure.md?plain=1#L200-L202

Change the urls in the Download and Homepage from http to https where there is a permanent redir to the secure site, as seen on the Repology website.