[1.7] docs: update link to version-range-spec #700
                
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version-range-spec has been moved.
moved https://github.com/package-url/vers-spec/blob/main/VERSION-RANGE-SPEC.rst to https://github.com/package-url/vers-spec/blob/main/VERSION-RANGE-SPEC.md
this PR adjust existing doc's links and references: link to the new vers-specrepo