There is no need to escape newlines in char data -
it makes the XML larger and harder to read.

Change-Id: I1c1fcee1bdffc705c7428f89ca90af8085d6fb73
Reviewed-on: https://go-review.googlesource.com/9310Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>