_content/doc/contribute: avoid jargon "CL" in text
_content/doc/contribute: avoid jargon "CL" in text

In this case just say "suggested change" instead.

For golang/go#18989

Change-Id: Ic52183dbf52e836407609ecd9bad7dcc14ba27df
Reviewed-on: https://go-review.googlesource.com/c/website/+/362355
Trust: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Meng Zhuo <3e6d300a356a3b86bc195677414a9ec5508ca893@golangcn.org>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website