Hey Dharmen Shah,
You have to escape such characters or use URL encoding. For example:
[Syntax](en.wikipedia.org/wiki/Syntax_%28programming_langu…)
Alternatively, you can use the link index method as follows:
link to [IHtmlDocument2 reference][1]
[1]: msdn.microsoft.com/en-us/library/aa752574(VS.85).aspx