Changelog for changes to grammar content

So I’ve been using Bunpro for about 3 weeks and I’ve noticed changes in several grammar pages, specifically in the About [grammar point] section.

For example, when I first started using Bunpro I noted down the following two sentences from N5 Lesson 2: 8/12

私はカラオケで歌を歌あない。 (Incorrect conjugation using あ)
私はカラオケで歌を歌わない。 (Correct conjugation using わ)

But today I opened the same page and the incorrect conjugation example disappeared?

So my question is: how can I tell which pages are updated? Is there a changelog page somewhere? I want to stay up to date when corrections or improvements are made. Thank you!