fix dead link for boost download & clearify wording #480
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https://dl.bintray.com/boostorg/release/1.70.0/source/boost_1_70_0.tar.gz is a dead link; new url: https://boostorg.jfrog.io/artifactory/main/release/1.70.0/source/boost_1_70_0.tar.gz
Added the word 'cores' to make it clearer what the j flag does and added a link to the documentation for Boost.