shared/idmap: Fix typo in comments #332

Job	Run time
Code	6m 45s
Documentation	6m 36s
System (1.20.x, cluster, dir)	11m 22s
Client (1.20.x, ubuntu-latest)	1m 9s
System (1.20.x, cluster, btrfs)	12m 44s
Client (1.20.x, macos-latest)	1m 57s
System (1.20.x, cluster, lvm)	12m 11s
Client (1.20.x, windows-latest)	2m 21s
System (1.20.x, cluster, zfs)	12m 47s
System (1.20.x, cluster, ceph)	15m 48s
System (1.20.x, cluster, random)	11m 27s
System (1.20.x, standalone, dir)	22m 5s
System (1.20.x, standalone, btrfs)	21m 45s
System (1.20.x, standalone, lvm)	40m 28s
System (1.20.x, standalone, zfs)	43m 1s
System (1.20.x, standalone, ceph)	1h 16m 2s
System (1.20.x, standalone, random)	31m 6s
System (stable, cluster, dir)	12m 6s
System (stable, standalone, dir)	22m 52s
System (tip, cluster, dir)	13m 33s
System (tip, standalone, dir)	21m 43s
	6h 39m 48s

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