master updated (df7bb79 -> ed1480b)

[Glenn Morris]

gm pushed a change to branch master.

      from  df7bb79   Add instructions for Tramp bug reports
      adds  06d0a66   ; Yet another last-minute change in Emacs manual for 
printing
      adds  d0625dc   ; One more change in back.texi.
       new  ed1480b   Merge from origin/emacs-27


Summary of changes:
 doc/emacs/back.texi       | 11 +++++++----
 doc/emacs/book-spine.texi |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)