correct reST syntax helps

Author: loriab

docs/compiling.rst

@@ -98,7 +98,7 @@ project. A working example can be found at [test_installed_target]_ .
     set_target_properties(example PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
                                              SUFFIX "${PYTHON_MODULE_EXTENSION}")
 
-..warning:
+.. warning::
 
     Since pybind11 is a metatemplate library, it is crucial that certain
     compiler flags are provided to ensure high quality code generation. In
@@ -109,8 +109,8 @@ project. A working example can be found at [test_installed_target]_ .
 
     These include Link Time Optimization (``-flto`` on GCC/Clang/ICPC, ``/GL``
     and ``/LTCG`` on Visual Studio). Default-hidden symbols on GCC/Clang/ICPC
-    ("-fvisibility=hidden") and .OBJ files with many sections on Visual Studio
-    ("/bigobj"). The :ref:`FAQ <faq:symhidden>` contains an
+    (``-fvisibility=hidden``) and .OBJ files with many sections on Visual Studio
+    (``/bigobj``). The :ref:`FAQ <faq:symhidden>` contains an
     explanation on why these are needed.
 
 .. [test_installed_target] https://github.com/pybind/pybind11/blob/master/tests/test_installed_target/CMakeLists.txt