vim: Normal mode is the normal mode (#1106)

* vim: Improvements we can can agree on

Remove spaces between keypresses (as it could lead users to think they
should type a space there).
Simplify regexp substitution example.
Add ...then... to search example.
Add quit without saving example.

* vim: Improvements we can can agree on

Move search keystrokes to the example title.
Keep original regexp substitution example. See conversation starting at
ee1472e76f (r82820204)

pages/common/vim.md

@@ -1,7 +1,7 @@
 # vim
 
 > Vi IMproved, a programmer's text editor, providing several modes for different kinds of text manipulation.
-> Pressing `i` enters edit mode; the normal mode (accessed via `<Esc>`) doesn't allow regular text editing.
+> Pressing `i` enters edit mode. `<Esc>` goes back to normal mode, which doesn't allow regular text insertion.
 
 - Open a file:
 
@@ -19,7 +19,7 @@
 
 `<Esc>u`
 
-- Search for a pattern in the file (press `n` to go to the next result):
+- Search for a pattern in the file (press `n`/`N` to go to next/previous match):
 
 `<Esc>/{{search_pattern}}<Enter>`
 
@@ -27,6 +27,10 @@
 
 `<Esc>:1,$s/{{pattern}}/{{replacement}}/g<Enter>`
 
-- Save (write) the file, and quit vim:
+- Save (write) the file, and quit:
 
 `<Esc>:wq<Enter>`
+
+- Quit without saving:
+
+`<Esc>:q!<Enter>`