Incorrect description of used_memory_peak_perc metric of info command

[jmf0526]

current doc:

docs/content/commands/info/index.md

Lines 154 to 155 in 3cffdba

	* `used_memory_peak_perc`: The percentage of `used_memory_peak` out of
	`used_memory`

should be

• used_memory_peak_perc: The percentage of used_memory out of used_memory_peak

[dwdougherty]

Thank you, @jmf0526. A fix is on the way.