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

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

Change-Id: Ia83b96a12ee6f367b4712e198ff673fb91c61b77
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>