[docs] Several updates to the Address Sanitizer webpage.

 - Added the description of the interceptor suppression.
 - Re-organized a bit: grouped a few things under the Issue Suppression
   section, grouped IOC and leaks under a section, placed symbolication
   info into Symbolizing the Reports section..
 - In supported platforms: "MacOS" -> "OS X"; added "iOS Simulator"
 - Added a paragraph to the Usage section describing when DYLD_INSERT_LIBRARIES
   might need to be used.
 - "attribute((no_sanitize_address))" -> "__attribute__((no_sanitize("address")))"
 - Updated Leak Sanitizer page with most up to date info.
....

http://reviews.llvm.org/D10559

llvm-svn: 240725