RTEMS | cpukit/shell: Improve medit documentation (!372)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/372

Project:Branches: opticron/rtems:main-medit-help to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

cpukit/shell: Improve medit documentation

The error message produced by attempting to use a large value as the
data to be written can be nonsensical for some inputs. This updates the
error message and the usage text to make expectations more clear.

Closes #2147


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