docs: Remove duplicate option variable

Author: nfnty

README.md

@@ -57,7 +57,6 @@ let g:python_highlight_all = 1
 | `g:python_version_2`                          | Python 2 mode                                                  | `0`     |
 | `b:python_version_2`                          | Python 2 mode (buffer local)                                   | `0`     |
 | `g:python_highlight_builtins`                 | Highlight builtin functions and objects                        | `0`     |
-| `g:python_highlight_builtins`                 | Highlight builtin functions and objects                        | `0`     |
 | `g:python_highlight_builtin_objs`             | Highlight builtin objects only                                 | `0`     |
 | `g:python_highlight_builtin_funcs`            | Highlight builtin functions only                               | `0`     |
 | `g:python_highlight_exceptions`               | Highlight standard exceptions                                  | `0`     |

doc/python-syntax.txt

@@ -56,9 +56,6 @@ following command to your `~/.config/nvim/init.vim` or `~/.vimrc`: >
 `g:python_highlight_builtins` (default `0`)
     Highlight builtin functions and objects
 
-`g:python_highlight_builtins` (default `0`)
-    Highlight builtin functions and objects
-
 `g:python_highlight_builtin_objs` (default `0`)
     Highlight builtin objects only