bug#46089: 26.3; Doc string of `read-regexp-suggestions'

[Drew Adams]

  Return a list of standard suggestions for `read-regexp'.
  By default, the list includes the tag at point, the last isearch regexp,
  the last isearch string, and the last replacement regexp.  `read-regexp'
  appends the list returned by this function to the end of values available
  via M-n.

What's "the tag at point"?  What does "tag" mean here?  I have no idea.

In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor `Microsoft Corp.', version 10.0.18362
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''