components/expat: just change format of expat.rst

preview will be better.

components/expat/expat.rst

@@ -1,21 +1,21 @@
 The Expat XML Parse Instruction
 =============================
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+
 Expat is an XML parser library written in C which be used for parse XML documents.
 
 It is a stream-oriented parser in which an application registers handlers for things the parser might find in the XML document.
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 It can parse some larger files.
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 -   Expat XML Parser support many different processor, but for the most part function you only need the following functions:
 
-    *XML_ParserCreate:*  Create a new parser object
+    **XML_ParserCreate**: Create a new parser object
 
-    *XML_SetElementHandler:*  Set handlers for start and end tags
+    **XML_SetElementHandler**: Set handlers for start and end tags
 
-    *XML_SetCharacterDataHandler:*  Set handler for text
+    **XML_SetCharacterDataHandler**: Set handler for text
 
-    *XML_Parse:*  Pass a buffer full of document to the parser
+    **XML_Parse**: Pass a buffer full of document to the parser
 
 More information about Expat library can be found on http://expat.sourceforge.net