Fix snippets to magic words (#1148)

en_us/docs/Users/Magic Word.md

@@ -1,7 +1,7 @@
 # Magic Word
 **Magic Words** are some characters that have special meanings. They will be evaluated to some pre-defined characters. For one simple example, `date` could be evaluated to the date of today.
 
-VNote support snippets in most of the input widgets. For example, you could use snippet for the note name when creating a note.
+VNote support magic words in most of the input widgets. For example, you could use magic word for the note name when creating a note.
 
 `%da% work log.md` will be evaluated as `20180128 work log.md` since `%da%` is a magic word which is defined as the date of today in the form `YYYYMMDD`.
 
@@ -43,4 +43,4 @@ Now we got two magic words `vnote` (based on another magic word `datetime`) and
 
 ![](_v_images/_1517139520_1176992512.png)
 
-Now in edit mode, we could hit `Ctrl+E S D` to insert current date.
+Now in edit mode, we could hit `Ctrl+E S D` to insert current date.