chore(docs/multiplier-points.md): Add guide to multiplier poitns #253

Job	Run time
lint	30s
build	28s
test	41s
verify (verify:rewards_streamer_mp)	6m 21s
coverage	24s
verify (verify:emergency_mode)	2m 44s
verify (verify:xp_token)	1m 21s
	12m 29s

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