\\{ in a doc string: what does it mean/do?

Question

What does this backslash syntax mean?

(defun elfeed-search-mode ()
  "Major mode for listing elfeed feed entries.
\\{elfeed-search-mode-map}"
  (interactive)

Answer 1

This form expands to a summary of a keymap.

From (elisp) Keys in Documentation:

\{MAPVAR}
stands for a summary of the keymap which is the value of the variable MAPVAR. The summary is made using describe-bindings.