Documentation for sanitizer special case list format and -f(no-)?sanitize-blacklist flag

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187871 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/index.rst b/docs/index.rst
index 5cdfb6b..293a61a 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -21,6 +21,7 @@
    AddressSanitizer
    ThreadSanitizer
    MemorySanitizer
+   SanitizerSpecialCaseList
    Modules
    FAQ