Merge "showmap: document in help memory is in KB" into main am: f6cbeaf95d am: bd8aa6e1d7

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/2786444

Change-Id: I41a98c78c3c332671435c0bc12f9442c4fbbcae2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>