Fix grammar in docs (#11642)

PeterJCLaw · web-flow · commit ee8a5ca58066 · 2021-11-29T14:09:49.000-08:00
diff --git a/docs/source/command_line.rst b/docs/source/command_line.rst
@@ -418,7 +418,7 @@ For more details, see :ref:`no_strict_optional`.
 Configuring warnings
 ********************
 
-The follow flags enable warnings for code that is sound but is
+The following flags enable warnings for code that is sound but is
 potentially problematic or redundant in some way.
 
 .. option:: --warn-redundant-casts
