Docs: Improvements on server commands
Docs: Improvements on server commands

Details:

- Reworked the description of all commands in the server
  group in chapter 5.

Signed-off-by: Andreas Maier <38dbb04957d222ea6ce72de72413b1e55e665472@de.ibm.com>

pywbem/pywbemtools,pywbem/pywbemtools