Fix mistake in just added docs ("user" page should be "utility" page).
Fix mistake in just added docs ("user" page should be "utility" page).

disassembler/Lifelines,MarcNo/lifelines,MarcNo/lifelines,disassembler/Lifelines,disassembler/Lifelines,MarcNo/lifelines,MarcNo/lifelines,disassembler/Lifelines