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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Version tags for cus-start.el options
Date: Sat, 11 Aug 2018 13:14:40 +0300
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I noticed that options that are defined in C don't have the "This
variable was first introduced..." part in the *Help* buffer, even if
cus-start.el does state the version for them.  Why is that?  And
customize-changed-options does somehow discover the version for those
variables, because it offers them in the buffer it creates.

So I wonder why don't show this info in *Help*.  Is it a bug?