runtime(tutor): apply fixes to runtime/tutor/tutor2

- Fix minor typos and formatting
- Restore accidentally removed file
- Normalize <C-r> to <CTRL-R>
- Apply reviewer suggestions

related: #17546

Co-authored-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Damien Lejay <damien@lejay.be>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/tutor/tutor2 b/runtime/tutor/tutor2
index f41b701..631b994 100644
--- a/runtime/tutor/tutor2
+++ b/runtime/tutor/tutor2
@@ -6,7 +6,7 @@
 
      Hic Sunt Dracones: if this is your first exposure to vim and you
      intended to avail yourself of the introductory chapter, kindly type
-     :q<enter> and try again.
+     :q!<ENTER> and run vimtutor for Chapter 1 instead.
 
      The approximate time required to complete this chapter is 8-10 minutes,
      depending upon how much time is spent with experimentation.
@@ -23,14 +23,14 @@
 
 MNEMONIC: into register(") named (a) (y)ank (i)nner (w)ord
 
-  3. Navigate forward to the word 'cookie' (fk or 2fc or $2b or /co<enter>)
+  3. Navigate forward to the word 'cookie' (fk or 2fc or $2b or /co<ENTER>)
      and type   "byiw
 
-  4. Navigate to any point on the word 'Vince' and type   ciw<C-r>a<ESC>
+  4. Navigate to any point on the word 'Vince' and type   ciw<CTRL-R>a<ESC>
 
 MNEMONIC: (c)hange (i)nner (w)ord with <contents of (r)egister> named (a)
 
-  5. Navigate to any point on the word 'cake' and type   ciw<C-r>b<ESC>
+  5. Navigate to any point on the word 'cake' and type   ciw<CTRL-R>b<ESC>
 
 --->  a) Edward will henceforth be in charge of the cookie rations
       b) In this capacity, Vince will have sole cake discretionary powers
@@ -40,8 +40,8 @@
 
 REFERENCE: 	Registers 	:h registers
 		Named Registers :h quotea
-		Motion 		:h motion.txt<enter> /inner<enter>
-		CTRL-R		:h insert<enter> /CTRL-R<enter>
+		Motion 		:h motion.txt<ENTER> /inner<ENTER>
+		CTRL-R		:h insert<ENTER> /CTRL-R<ENTER>
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -54,10 +54,10 @@
 
   2. Navigate to any point on the supplied number
 
-  3. Type ciw<C-r>=60*60*24<enter>
+  3. Type ciw<CTRL-R> followed by  =60*60*24<ENTER>
 
   4. On the next line, enter insert mode and add today's date with 
-     <C-r>=system('date')<enter>
+     <CTRL-R> followed by  =system('date')<ENTER>
 
 NOTE: All calls to system are OS dependent, e.g. on Windows use 
       system('date /t')   or  :r!date /t
@@ -79,7 +79,7 @@
 
   1. Move the cursor to the line below marked --->
 
-  2. yank the zeroth line, then inspect registers with :reg<enter>
+  2. yank the zeroth line, then inspect registers with :reg<ENTER>
 
   3. delete line 0. with "cdd, then inspect registers
      (Where do you expect line 0 to be?)
@@ -118,7 +118,7 @@
 NOTE: a common conundrum when coding is moving around large chunks of code.
       The following technique helps avoid number line calculations associated
       with operations like   "a147d   or   :945,1091d a   or even worse using
-      i<C-r>=1091-945<enter>   first
+      i<CTRL-R> followed by   =1091-945<ENTER>   first
 
   1. Move the cursor to the line below marked --->
 
@@ -172,9 +172,11 @@
   3. Change a whole word from anywhere within a word:   ciw
   4. Insert text directly from registers in insert mode:   (C-r)a
 
-  5. Insert the results of simple arithmetic operations: (C-r)=60*60<enter>
+  5. Insert the results of simple arithmetic operations: <CTRL-R> followed by
+     =60*60<ENTER>
      in insert mode
-  6. Insert the results of system calls: (C-r)=system('ls -1')
+  6. Insert the results of system calls: <CTRL-R> followed by
+     =system('ls -1')<ENTER>
      in insert mode
 
   7. Inspect registers with   :reg