[yocto] yocto ref manual: app B.5 conflates BB_ENV_WHITELIST with BB_ENV_EXTRAWHITE

[Robert P. J. Day]

  explanation in B.5 starts off talking about BB_ENV_WHITELIST, but
supplies an example referring to BB_ENV_EXTRAWHITE.

rday

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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