Fix formatting

Author: vogelsgesang

clang/docs/DebuggingCoroutines.rst

@@ -360,7 +360,7 @@ type of a task is a template argument. For simplicity's sake, we hard-coded the
 ``int`` type in this example.
 
 Stack traces of in-flight coroutines
------------------------------------
+------------------------------------
 
 Let's assume you have the following program and set a breakpoint inside the
 ``write_output`` function. There are multiple call paths through which this
@@ -466,7 +466,7 @@ One such solution is to store the list of in-flight coroutines in a collection:
   };
 
 With this in place, it is possible to inspect ``inflight_coroutines`` from the
-debugger, and rely on LLDB's pretty-printer for ``std::coroutine_handle``s to
+debugger, and rely on LLDB's pretty-printer for ``std::coroutine_handle`` to
 inspect the coroutines.
 
 This technique will track *all* coroutines, also the ones which are currently