fixed issues reported by Lint (DOCtor-RST)

Author: gr8b

components/yaml.rst

@@ -441,14 +441,14 @@ By default, digit-only array keys are dumped as integers. You can use the
     // '200': foo
 
 Dumping Collection of Maps
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 By default, the collection of maps uses a hyphen on a separate line as a delimiter.
 To use the delimiter line as part of the map dump, use the ``Yaml::DUMP_COMPACT_NESTED_MAPPING`` flag.
 
 Dump without flag set:
 
-.. code-block:: text
+::
 
     planets:
       -
@@ -460,11 +460,11 @@ Dump without flag set:
 
 Dump with ``Yaml::DUMP_COMPACT_NESTED_MAPPING`` flag set:
 
-.. code-block:: php
+::
 
     $dumped = Yaml::dump(['planets' => $planets], 2, 0, Yaml::DUMP_COMPACT_NESTED_MAPPING);
 
-.. code-block:: text
+::
 
     planets:
       - name: Mercury