docs: clarify npm init @latest behavior

[wraithgar]

Closes: #3821

[npm-robot]

found 20 benchmarks with statistically significant performance improvements

• app-large: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit
• app-medium: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit

timing results

app-large	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	70.677 ±0.20	37.980 ±0.08	24.155 ±0.66	26.684 ±0.90	3.746 ±0.08	3.858 ±0.18	3.127 ±0.03	15.913 ±0.19	3.035 ±0.05	4.324 ±0.05
#4435	0.533 ±0.01	0.529 ±0.00	0.513 ±0.03	0.536 ±0.02	0.523 ±0.00	0.519 ±0.00	0.511 ±0.02	0.539 ±0.01	0.522 ±0.01	0.544 ±0.01

app-medium	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	43.871 ±2.71	29.091 ±0.56	17.471 ±0.30	18.502 ±0.08	3.595 ±0.04	3.419 ±0.09	3.102 ±0.08	11.918 ±0.38	2.901 ±0.04	3.949 ±0.05
#4435	0.526 ±0.02	0.519 ±0.01	0.566 ±0.01	0.508 ±0.01	0.546 ±0.04	0.549 ±0.00	0.507 ±0.00	0.530 ±0.02	0.521 ±0.01	0.500 ±0.00