common-tasks.rst: remove SRC_URI:append from examples

Using SRC_URI:append without recipe, machine or architecture specific
limitations makes the :append'ed text more difficult to override than if
the "+=" operator was used. This makes it hard for example to override
SRC_URI completely in a bbappend to update the full recipe to a newer
version. Thus common, reusable layers which users are meant to re-use
and customize should not use SRC_URI:append but SRC_URI += instead.

(From yocto-docs rev: 34533ac2ee5d85a41330dd865062dce1e46b83fc)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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