Fix a documentation bug: "make release" uses "make buildworld" not "make world", as the first step of building the release. While here, remove another mention of "make world", as the latter is no longer supported by src/Makefile.
Fix a documentation bug: "make release" uses "make buildworld"
not "make world", as the first step of building the release.
While here, remove another mention of "make world", as the
latter is no longer supported by src/Makefile.

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