doc: correct number of install phases
doc: correct number of install phases

Credit: da39a3ee5e6b4b0d3255bfef95601890afd80709@eymengunay
Reviewed-By: da39a3ee5e6b4b0d3255bfef95601890afd80709@othiym23
PR-URL: https://github.com/npm/npm/pull/10650

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