[PR] Documentation: update some command descriptions [nuttx]

[via GitHub]

Junbo-Zheng opened a new pull request, #11621:
URL: https://github.com/apache/nuttx/pull/11621

   ## Summary
   
   1. Documentation: add `-h` option description for ls command
       - Reference: https://github.com/apache/nuttx-apps/pull/1821
   
   2. Documentation: add `uptime` command description
       - Reference: https://github.com/apache/nuttx-apps/pull/1319
   
   3. Documentation: add `expr` command description
       - Reference: https://github.com/apache/nuttx-apps/pull/2268
   
   4. Documentation: add `-u` and `+%format` description for date command
       - Reference:
           - https://github.com/apache/nuttx-apps/pull/745
           - https://github.com/apache/nuttx-apps/pull/2273
   
   ## Impact
   Documentation only.
   
   ## Testing
   
   


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