Looks like the below corrections are needed in the helpx dcumentation.
HTL Java Use-API
1) The component path needs to be updated as "apps/my-example/components/info/info.html"
2) The Java class name of Info.java should be updated to ExtraHelper.java
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Thank you for the feedback -- we will pass this to the doc team. You cam report doc/article bugs here. A lot of Adobe Staff such as myself, Kautuk and many others monitor these forums each day.