Change the command to lowercase style (#2327)

* Change the command to lowercase style

* Reorganize wrong content

Author: jimcat8

docs/books/admin_guide/05-vi.md

@@ -288,7 +288,7 @@ These operations are done in *command* mode.
 
 * Paste a word once or `n` times after the cursor:
 
-++p++ or ++"n"+"p"++
+++"p"++ or ++"n"+"p"++
 
 * Paste a word once or `n` times before the cursor:
 
@@ -337,13 +337,21 @@ These operations are done in *command* mode.
 
 ++"y"+"$"++
 
-* Delete (cut) the text from the current line:
+* Delete (cut) the contents from the cursor line to the last line of the file:
+
+++"d"+g++
+
+* Delete (cut) the contents from the cursor line to the last line of the screen:
+
+++"d"+l++
+
+* Copy the content from the cursor line to the end of the file:
 
-++"d"+l++ or ++"d"+g++
+++"y"+g++
 
-* Copy the text from the current line:
+* Copy the content from the cursor line to the end of the screen
 
-++"y"+l++ or ++"y"+g++
+++"y"+l++
 
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