[yocto] current poky ref manual doesn't document some top level yocto entries

[Robert P. J. Day]

  currently, the yocto/poky ref manual, Appendix A.1, "Top level core
components", doesn't mention the entries meta-yocto or meta-hob.  it
also lists the meta-rt layer, which has been moved to oe-core.

  i also don't think it should list "build", as that's a generated
artifact and is documented adequately elsewhere.

  in any event, the ref manual should be updated to reflect the
current yocto structure.

rday

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

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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