minor #18711 fix :phpfunction: usages (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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fix :phpfunction: usages

Commits
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600fd18 fix :phpfunction: usages

Author: xabbuh

components/serializer.rst

@@ -1006,8 +1006,8 @@ Option                           Description
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 ``json_decode_associative``      If set to true returns the result as an array, returns a nested ``stdClass`` hierarchy otherwise.           ``false``
 ``json_decode_detailed_errors``  If set to true, exceptions thrown on parsing of JSON are more specific. Requires `seld/jsonlint`_ package.  ``false``
-``json_encode_options``          `$flags`_ passed to :phpfunction:`json_decode`_ function.                                                   ``0``
-``json_decode_options``          `$flags`_ passed to :phpfunction:`json_encode`_ function.                                                   ``\JSON_PRESERVE_ZERO_FRACTION``
+``json_encode_options``          `$flags`_ passed to :phpfunction:`json_decode` function.                                                    ``0``
+``json_decode_options``          `$flags`_ passed to :phpfunction:`json_encode` function.                                                    ``\JSON_PRESERVE_ZERO_FRACTION``
 ``json_decode_recursion_depth``  Sets maximum recursion depth.                                                                               ``512``
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