vim: add line numbers example (#4608)

pages/common/vim.md

@@ -12,13 +12,9 @@
 
 `:help<Enter>`
 
-- Save a file:
+- Save and Quit:
 
-`:write<Enter>`
-
-- Quit without saving:
-
-`:quit!<Enter>`
+`:wq<Enter>`
 
 - Open a file at a specified line number:
 
@@ -35,3 +31,7 @@
 - Perform a regex substitution in the whole file:
 
 `:%s/{{pattern}}/{{replacement}}/g<Enter>`
+
+- Display the line numbers:
+
+`:set nu<Enter>`