Fix broken ref of HighLevelSILOptimizations.rst on SIL.rst

Author: LucianoPAlmeida

docs/SIL.rst

@@ -29,7 +29,7 @@ representation that can be used for code distribution, but it can also express
 target-specific concepts as well as LLVM can.
 
 For more information on developing the implementation of SIL and SIL passes, see
-`SILProgrammersManual.md <SILProgrammersManual.md>`_ .
+`SILProgrammersManual.md <SILProgrammersManual.md>`_.
 
 SIL in the Swift Compiler
 -------------------------
@@ -123,7 +123,7 @@ IR.
   high-level optimizations on basic Swift containers such as Array or String.
   Domain specific optimizations require a defined interface between
   the standard library and the optimizer. More details can be found here:
-  :ref:`HighLevelSILOptimizations`
+  `HighLevelSILOptimizations <HighLevelSILOptimizations.rst>`_
 
 Syntax
 ------