Cleanup UefiShellNetwork1CommandsLib commands help output string to :

Cleanup UefiShellNetwork1CommandsLib commands help output string to :
  * Follow a consistent style
  * Add consistent sections: NOTES, EXAMPLES, RETURN VALUES, etc.
  * Wrap the text to fit in 80x25 formatted console output
  * Remove excessive and very verbose examples output

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Tapan Shah <tapandshah@hp.com>
Reviewed-By: Jaben Carsey <jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15986 6f19259b-4bc3-4df7-8a09-765794883524