doc: fix writable.write link

Author: shama

doc/api/stream.markdown

@@ -1460,7 +1460,7 @@ modify them.
 [`_read(size)`]: #stream_readable_read_size_1
 [`_read()`]: #stream_readable_read_size_1
 [_read]: #stream_readable_read_size_1
-[`writable.write(chunk)`]
+[`writable.write(chunk)`]: #stream_writable_write_chunk_encoding_callback
 [`write(chunk, encoding, callback)`]: #stream_writable_write_chunk_encoding_callback
 [`write()`]: #stream_writable_write_chunk_encoding_callback
 [`stream.write(chunk)`]: #stream_writable_write_chunk_encoding_callback