Basically, the bot is deleting everything but the url from {{webarchive}}, and appending it the citation template with an empty parameter name (just a pipe and then a equals sign), e.g.
```
<ref name="MCT Cowper leads">{{cite news |last1=Burgess |first1=Jill |title=Cowper Leads Push |url=http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ |accessdate=6 June 2014 |work=Mandurah Coastal Times |date=22 January 2014 |archiveurl=https://web.archive.org/web/20140606014639/http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ |archivedate=6 June 2014 |deadurl=no}} {{webarchive |format=addlarchives |url=https://www.webcitation.org/6VaYrmu2q?url=http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ |date=15 January 2015}}</ref>
```
got turned into
```
<ref name="MCT Cowper leads">{{cite news |last1=Burgess |first1=Jill |title=Cowper Leads Push |url=http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ |accessdate=6 June 2014 |work=Mandurah Coastal Times |date=22 January 2014 |archiveurl=https://web.archive.org/web/20140606014639/http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ |archivedate=6 June 2014 |deadurl=no |=http://www.inmycommunity.com.au/news-and-views/local-news/Cowper-leads-push/7655635/ }}</ref>
```
See https://en.wikipedia.org/w/index.php?title=Forrest_Highway&diff=854660367&oldid=847603627 for that and several other examples.