This bug is still an issue if you edit your profile in meta.stackexchange.com.
Placeholder text on "About You" textarea is:
Tell us more about you and your the software that powers the Stack Exchange network background
This is not grammatically the profile page looks great correct
I'm raising this bug as a new question (rather than a post within that page) as requested by @Jaydles in his post Help us test the shiny new “User Activity” page! (Plus a bunch of new features.), to raise a new question if a bug has been found as it is not feedback about the new features.