Fix the clang Sphinx bot

This addresses failures introduced by:
https://lab.llvm.org/buildbot/#/builders/92/builds/32809

It also fixes a secondary issue that crept in after the above build
started failing.

Author: AaronBallman

clang/docs/JSONCompilationDatabase.rst

@@ -30,7 +30,7 @@ Supported Systems
 =================
 
 Clang has the ability to generate compilation database fragments via
-the :option:`-MJ argument <clang -MJ\<arg>>`. You can concatenate those
+``-MJ argument <clang -MJ\<arg>>``. You can concatenate those
 fragments together between ``[`` and ``]`` to create a compilation database.
 
 Currently `CMake <https://cmake.org>`_ (since 2.8.5) supports generation

clang/docs/SanitizerCoverage.rst

@@ -350,6 +350,7 @@ The table is encoded in a special section named ``sancov_cfs``
 Example:
 
 .. code-block:: c++
+
   int foo (int x) {
     if (x > 0)
       bar(x);