base.bbclass: Add note about base_path_relative
base.bbclass: Add note about base_path_relative

Signed-off-by: Chris Larson <4c8c411260e601995081b113a5ef94a26eff2b25@mentor.com>

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/overo-oe,scottellis/overo-oe,sentient-energy/emsw-oe-mirror,SIFTeam/openembedded,bticino/openembedded,nx111/openembeded_openpli2.1_nx111