Update components/yaml.rst

Co-authored-by: Christian Flothmann <[email protected]>

Author: alamirault

components/yaml.rst

@@ -419,7 +419,7 @@ you can dump them as ``~`` with the ``DUMP_NULL_AS_TILDE`` flag::
     // foo: ~
 
 Dumping Numeric Keys as Strings
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Sometime YAML keys must be always string. This component don't convert keys to string by default but you can
 make it convert numeric keys as string by using the ``DUMP_NUMERIC_KEY_AS_STRING`` flag::