Adds an example to SRC_URI that explains how to name sources in SRC_URI
and how to associate SRCREVs and checksums with the names
(From yocto-docs rev: 900af0addab7d6ea465922957f881a13012429ed)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>