docs: set latex table style to modern default

The option was introduced for sphinx 5.0, but back then still using an
empty set as default value, but since (for us still future) 6.0 the
default will be ['booktabs', 'colorrows'], which looks better so use
it now already.

https://www.sphinx-doc.org/en/master/usage/configuration.html#confval-latex_table_style

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

docs/conf.py

@@ -415,6 +415,8 @@ latex_logo = "images/proxmox-logo.png"
 #
 # latex_domain_indices = True
 
+latex_table_style = ['booktabs', 'colorrows']
+
 
 # -- Options for Epub output ----------------------------------------------