RTEMS | libmisc/shell: Add -a to print all vars in the shell getenv command (!1241)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on cpukit/libmisc/shell/main_getenv.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1241#note_150068

 >  
 >    if (argc != 2)
 >    {
 > -    printf ("error: only argument is the variable name\n");
 > +    printf ("error: -a or the variable name\n");

This is a bit unclear as an error message. Perhaps `error: available arguments are "-a" or a variable name` would be better?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1241#note_150068
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