[Documentation] Fix Release Notes format issues.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@332405 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.rst

@@ -99,12 +99,13 @@ New Compiler Flags
 ------------------
 
 - :option:`-fstrict-float-cast-overflow` and
-  :option:`-fno-strict-float-cast-overflow` -
-   When a floating-point value is not representable in a destination integer
-   type, the code has undefined behavior according to the language standard.
-   By default, Clang will not guarantee any particular result in that case.
-   With the 'no-strict' option, Clang attempts to match the overflowing behavior
-   of the target's native float-to-int conversion instructions.
+  :option:`-fno-strict-float-cast-overflow`.
+
+  When a floating-point value is not representable in a destination integer
+  type, the code has undefined behavior according to the language standard. By
+  default, Clang will not guarantee any particular result in that case. With the
+  'no-strict' option, Clang attempts to match the overflowing behavior of the
+  target's native float-to-int conversion instructions.
 
 - ...
 
@@ -127,7 +128,7 @@ Modified Compiler Flags
   this: `clang --autocomplete=-cc1,-xc++,-fsyn`.
 
 New Pragmas in Clang
------------------------
+--------------------
 
 Clang now supports the ...