ref-manual: add a note about hard-coded passwords

It seems prudent to point out that hard-coding passwords in the manner
detailed in the example is not a good idea in production. This type of
mistake has unfortunately been made by many device vendors (outside of
the Yocto Project context) leading to security vulnerabilities.

(From yocto-docs rev: 1d07dba9423ae0a841eccb58c297e31b63c3965d)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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