/usr/share/std_msgs/msg/MultiArrayDimension.msg is in ros-std-msgs 0.5.10-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | string label # label of given dimension
uint32 size # size of given dimension (in type units)
uint32 stride # stride of given dimension
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