doc: fix ordering error in errors.md

PR-URL: nodejs#13274
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/errors.md

@@ -558,15 +558,6 @@ found [here][online].
   the connected party did not properly respond after a period of time. Usually
   encountered by [`http`][] or [`net`][] -- often a sign that a `socket.end()`
   was not properly called.
-
-  <a id="ERROR_CODES"></a>
-  ### ERROR CODES
-
-  <a id="ERR_INDEX_OUT_OF_RANGE"></a>
-  ### ERR_INDEX_OUT_OF_RANGE
-
-The `'ERR_INDEX_OUT_OF_RANGE'` error code is used when a given index is out of the accepted range.
-
 
 <a id="nodejs-error-codes"></a>
 ## Node.js Error Codes
@@ -585,6 +576,12 @@ The `ERR_CONSOLE_WRITABLE_STREAM` error code is thrown when `Console` is
 instantiated without `stdout` stream or when `stdout` or `stderr` streams
 are not writable.
 
+<a id="ERR_INDEX_OUT_OF_RANGE"></a>
+### ERR_INDEX_OUT_OF_RANGE
+
+The `'ERR_INDEX_OUT_OF_RANGE'` error code is used when a given index is out of
+the accepted range.
+
 <a id="ERR_INVALID_ARG_TYPE"></a>
 ### ERR_INVALID_ARG_TYPE