doc: clarify maxRSS unit in `process.resourceUsage()` · nodejs/node@b962560

Original file line number	Diff line number	Diff line change
`@@ -3725,7 +3725,7 @@ added: v12.6.0`
`3725`	`3725`	* `systemCPUTime` {integer} maps to `ru_stime` computed in microseconds.
`3726`	`3726`	It is the same value as [`process.cpuUsage().system`][process.cpuUsage].
`3727`	`3727`	* `maxRSS` {integer} maps to `ru_maxrss` which is the maximum resident set
`3728`		`- size used in kilobytes.`
	`3728`	`+ size used in kibibytes (1024 bytes).`
`3729`	`3729`	* `sharedMemorySize` {integer} maps to `ru_ixrss` but is not supported by
`3730`	`3730`	`any platform.`
`3731`	`3731`	* `unsharedDataSize` {integer} maps to `ru_idrss` but is not supported by