docs: fix unpublish docs to auto generate usage

[wraithgar]

Also add explanation of what --force does for unpublish

[npm-robot]

no statistically significant performance changes detected

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	60.926 ±3.68	37.037 ±0.00	23.343 ±0.02	25.849 ±0.70	3.685 ±0.04	3.857 ±0.21	3.023 ±0.07	15.331 ±0.01	3.075 ±0.04	4.360 ±0.06
#4584	58.805 ±1.92	38.217 ±0.78	23.364 ±0.31	26.764 ±0.98	3.783 ±0.01	3.860 ±0.10	3.032 ±0.05	15.376 ±0.10	2.933 ±0.03	4.329 ±0.12

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	43.455 ±2.26	28.105 ±0.40	17.147 ±0.12	18.201 ±0.68	3.448 ±0.05	3.459 ±0.13	3.461 ±0.37	11.813 ±0.20	2.926 ±0.07	4.210 ±0.00
#4584	45.568 ±2.36	28.939 ±0.93	17.105 ±0.23	18.239 ±0.04	3.393 ±0.09	3.459 ±0.07	3.183 ±0.07	11.677 ±0.27	2.877 ±0.09	4.056 ±0.02