Use an anonymous hyperlink reference to eliminate Sphinx warnings.

llvm-svn: 261523
diff --git a/clang/docs/SanitizerCoverage.rst b/clang/docs/SanitizerCoverage.rst
index 8ee2159..024511c 100644
--- a/clang/docs/SanitizerCoverage.rst
+++ b/clang/docs/SanitizerCoverage.rst
@@ -244,7 +244,7 @@
 =================
 
 This experimental feature is inspired by
-`AFL <http://lcamtuf.coredump.cx/afl/technical_details.txt>`_'s coverage
+`AFL <http://lcamtuf.coredump.cx/afl/technical_details.txt>`__'s coverage
 instrumentation. With additional compile-time and run-time flags you can get
 more sensitive coverage information.  In addition to boolean values assigned to
 every basic block (edge) the instrumentation will collect imprecise counters.
@@ -301,7 +301,7 @@
 These callbacks are not implemented in the Sanitizer run-time and should be defined
 by the user. So, these flags do not require the other sanitizer to be used.
 This mechanism is used for fuzzing the Linux kernel (https://github.com/google/syzkaller)
-and can be used with `AFL <http://lcamtuf.coredump.cx/afl>`_.
+and can be used with `AFL <http://lcamtuf.coredump.cx/afl>`__.
 
 Tracing data flow
 =================