[yocto] contradictory explanations of IMAGE_INSTALL in yocto manuals

[Rudolf Streif]

I tried the versions _append and += as well as _prepend and =+ with the
IMAGE_INSTALL and other variables. So far I have not run into any issues
where one would behave differently from the other. The only thing you have
to remember with the _append and _prepend versions is that you have to
include a space at the beginning for _append and at the end for _prepend.
Although I have found that not always to be consistent either. However, an
additional space does not hurt.

Rudi
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