fix typo

Author: AlightSoulmate

README.rst

@@ -114,9 +114,7 @@ Want to know if a word you're proposing exists in codespell already? It is possi
     echo "word" | codespell -
     echo "1stword,2ndword" | codespell -
 
-You can select the optional builtin dictionary with the ``--builtin`` option. Use
-``--builtin=all`` to enable them all. This only works without custom ``-D``
-dictionaries.
+You can select the optional builtin dictionary with the ``--builtin`` option. Use ``--builtin=all`` to enable them all. This only works without custom ``-D`` dictionaries.
 
 Ignoring words
 --------------