Remedy ineffective backslashes and fix regexps

* lisp/info.el (Info-read-node-name-2): Double backslash for intended
escaping effect.
* lisp/term.el (term-send-function-key): Remove redundant `+`.
* lisp/leim/quail/indian.el:
* lisp/simple.el (scratch-buffer, get-scratch-buffer-create):
Remove ineffective backslashes.

lisp/info.el

@@ -1834,7 +1834,7 @@ list of valid filename suffixes for Info files.  See
           ;; include it (without the suffix).
           (when (and (string-match suffix file)
                      ;; But exclude subfiles of split Info files.
-                     (not (string-match "\.info-[0-9]+" file))
+                     (not (string-match "\\.info-[0-9]+" file))
                      ;; And exclude backup files.
                      (not (string-match "~\\'" file)))
             (push (substring file 0 (match-beginning 0))

lisp/leim/quail/indian.el

@@ -730,10 +730,10 @@ Full key sequences are listed below:")
  ("`*" ?𑁙)
  ("9"  ?𑁯)
  ("`9" ?9)
- ("`\(" ?𑁚)
+ ("`(" ?𑁚)
  ("0"  ?𑁦)
  ("`0" ?0)
- ("`\)" ?𑁛)
+ ("`)" ?𑁛)
  ("`-" ?𑁜)
  ("`_" ?𑁝)
  ("`=" ?𑁞)
@@ -780,8 +780,8 @@ Full key sequences are listed below:")
  ("P"  ?𑀨)
  ("`p" ?𑁳)
  ("`P" ?𑁱)
- ("`\[" ?𑁴)
- ("`\{" ?𑁲)
+ ("`[" ?𑁴)
+ ("`{" ?𑁲)
  ("a"  ?𑀸)
  ("A"  ?𑀆)
  ("`a" ?𑀅)
@@ -863,7 +863,7 @@ Full key sequences are listed below:")
 ("`9" ?9)
 ("0"  ?०)
 ("`0" ?0)
-("`\)" ?𑂻)
+("`)" ?𑂻)
 ("`\\" ?𑃀)
 ("`|" ?𑃁)
 ("`"  ?𑂗)
@@ -965,7 +965,7 @@ Full key sequences are listed below:")
 ("`9" ?9)
 ("0"  ?𑓐)
 ("`0" ?0)
-("`\)" ?𑓆)
+("`)" ?𑓆)
 ("`\\" ?।)
 ("`|" ?॥)
 ("`"  ?𑒙)
@@ -1071,7 +1071,7 @@ Full key sequences are listed below:")
 ("`9" ?9)
 ("0"  ?𑇐)
 ("`0" ?0)
-("`\)" ?𑇇)
+("`)" ?𑇇)
 ("`\\" ?𑇅)
 ("`|" ?𑇆)
 ("`"  ?𑆛)
@@ -1188,9 +1188,9 @@ Full key sequences are listed below:")
 ("`8" ?𑗑)
 ("`*" ?𑗈)
 ("`9" ?𑗒)
-("`\(" ?𑗉)
+("`(" ?𑗉)
 ("`0" ?𑗓)
-("`\)" ?𑗄)
+("`)" ?𑗄)
 ("`\\" ?𑗂)
 ("`|" ?𑗃)
 ("`"  ?𑖘)

lisp/simple.el

@@ -10214,7 +10214,7 @@ the number of seconds east of Greenwich.")
   )
 
 (defun get-scratch-buffer-create ()
-  "Return the \*scratch\* buffer, creating a new one if needed."
+  "Return the *scratch* buffer, creating a new one if needed."
   (or (get-buffer "*scratch*")
       (let ((scratch (get-buffer-create "*scratch*")))
         ;; Don't touch the buffer contents or mode unless we know that
@@ -10227,7 +10227,7 @@ the number of seconds east of Greenwich.")
         scratch)))
 
 (defun scratch-buffer ()
-  "Switch to the \*scratch\* buffer.
+  "Switch to the *scratch* buffer.
 If the buffer doesn't exist, create it first."
   (interactive)
   (pop-to-buffer-same-window (get-scratch-buffer-create)))

lisp/term.el

@@ -1430,7 +1430,7 @@ Entry to this mode runs the hooks on `term-mode-hook'."
     (when (and (= (length key) 1)
                (symbolp (elt key 0)))
       (let ((name (symbol-name (elt key 0))))
-        (when (string-match "\\`f\\([0-9]++\\)\\'" name)
+        (when (string-match "\\`f\\([0-9]+\\)\\'" name)
           (let* ((num (string-to-number (match-string 1 name)))
                  (ansi
                   (cond