Update /en/lessons/applied-archival-downloading-with-wget

[anisa-hawes]

• Correct typing error, line 185
• Change live links to inline code, lines 200, 202
• Update link to viewer, referenced line 196

Closes #3691

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[anisa-hawes]

Hello Alex @hawc2,

Just to keep you updated on some link fixes in the EN lesson applied-archival-downloading-with-wget.

The lesson already includes a warning which explains that one section doesn't work because the National Archives of Australia changed the URL patterns within their catalogues.

I've therefore changed live links to inline code in that section so that they are no longer scanned by our html checker.