doc: error modes of writable

doc/api/stream.md

@@ -432,6 +432,19 @@ file.end('world!');
 // Writing more now is not allowed!
 ```
 
+[`stream.end()`][stream-end] will call its callback and emit `'error'`
+with (in order of precedence):
+* `ERR_STREAM_WRITE_AFTER_END` if `chunk` is not nully and
+ [`stream.end()`][stream-end] has been called.
+* `ERR_STREAM_DESTROYED` if `chunk` is not nully and
+ [`stream.destroy()`][writable-destroy] has been called.
+* `ERR_INVALID_ARG_TYPE` if `chunk` is not nully and
+ `chunk` is not a `string` when not in `objectMode`.
+* `ERR_STREAM_ALREADY_FINISHED` if
+ [`writable.writableFinished`][] is `true`.
+* Last error emitted by the instance through `'error'` before
+ [`writable.writableFinished`][] is set to `true`.
+
 ##### writable.setDefaultEncoding(encoding)
 <!-- YAML
 added: v0.11.15
@@ -619,6 +632,15 @@ write('hello', () => {
 
 A `Writable` stream in object mode will always ignore the `encoding` argument.
 
+[`stream.write()`][stream-write] will call its callback and emit `'error'`
+with (in order of precedence):
+* `ERR_STREAM_WRITE_AFTER_END` if [`stream.end()`][stream-end] has been called.
+* `ERR_STREAM_DESTROYED` if [`stream.destroy()`][writable-destroy] has been
+  called.
+* `ERR_STREAM_NULL_VALUES` if `chunk` is `null`.
+* `ERR_INVALID_ARG_TYPE` if `chunk` is not a `string` when not in `objectMode`.
+* Any error forwarded from `writable._write()` or `writable._writev()`.
+
 ### Readable Streams
 
 Readable streams are an abstraction for a *source* from which data is