markdown syntax

Author: liusongwei

text/scanner/README.md

@@ -6,7 +6,9 @@
     - [func (pos *Position) IsValid() bool](IsValid.md)
     - [func (pos Position) String() string](String.md)
 - type Scanner
+
 	Scanner用于从io.Reader中读取Unicode字符或词法单元
+
     - [func (s *Scanner) Init(src io.Reader) *Scanner](Init.md)
     - [func (s *Scanner) Next() rune](Next.md)
     - [func (s *Scanner) Peek() rune](Peek.md)