Documentation | Add documentation for flashdev command (#50)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm created an issue: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/50



## Summary
Currently there is no documentation for the `flashdev` command in the shell guide. This needs to be added.

## Steps to reproduce


### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/issues/50
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