Some of these headings had the incorrect number of "underlines" and so would...

Some of these headings had the incorrect number of "underlines" and so would get warnings when generating the content from Sphinx. No functional changes intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201713 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ThreadSafetyAnalysis.rst

@@ -80,7 +80,7 @@ as such (using ``LOCK``/``UNLOCK_FUNCTION``).
 
 
 Running The Analysis
----------------------
+--------------------
 
 To run the analysis, simply compile with the ``-Wthread-safety`` flag, e.g.
 
@@ -388,7 +388,7 @@ as ``(UN)LOCK_FUNCTION``.  See :ref:`mutexheader`, below, for example uses.
 
 
 ASSERT_EXCLUSIVE_LOCK(...) and ASSERT_SHARED_LOCK(...)
---------------------------------------------------
+------------------------------------------------------
 
 These are attributes on a function or method that does a run-time test to see
 whether the calling thread holds the given capability.  The function is assumed
@@ -437,7 +437,7 @@ Frequently Asked Questions
 .. _limitations:
 
 Known Limitations 
-==================
+=================
 
 Lexical scope
 -------------