local.conf.sample: Document proxy setup.
local.conf.sample: Document proxy setup.

Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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ago-oe-dev,sampov2/audio-openembedded,JamesAng/oe,John-NY/overo-oe,nx111/openembeded_openpli2.1_nx111,dellysunnymtech/sakoman-oe,sledz/oe