Regexp isearch can search through multiple nodes. Add Info-search-backward.

etc/NEWS

@@ -519,6 +519,13 @@ mode toggling function instead.
 *** A numeric prefix argument of `info' selects an Info buffer
 with the number appended to the *info* buffer name.
 
+*** Regexp isearch (C-M-s and C-M-r) can search through multiple nodes.
+Failed isearch wraps to the top/final node.
+
+*** New search commands: `Info-search-case-sensitively' (bound to S),
+`Info-search-backward', and `Info-search-next' which repeats the last
+search without prompting for a new search string.
+
 *** New command `Info-history' (bound to L) displays a menu of visited nodes.
 
 *** New command `Info-toc' (bound to T) creates a node with table of contents
@@ -532,11 +539,6 @@ possible matches.
 the current Info node name into the kill ring.  With a zero prefix
 arg, puts the node name inside the `info' function call.
 
-*** New command `Info-search-case-sensitively' (bound to S).
-
-*** New command `Info-search-next' (unbound) repeats the last search
-without prompting for a new search string.
-
 *** New face `info-xref-visited' distinguishes visited nodes from unvisited
 and a new option `Info-fontify-visited-nodes' to control this.