[Bug] Replace wms server in r.out.vtk example

[echoix]

Describe the bug

The example here uses a dead WMS server.

grass/raster/r.out.vtk/r.out.vtk.html

Lines 95 to 109 in 5e27d1a

	<div class="code"><pre>
	#set the region
	g.region n=4926990 s=4914840 w=591570 e=607800 res=30 -p
	# using r.in.wms to create RGB data to get a satellite coverage
	r.in.wms layers=global_mosaic mapserver=http://wms.jpl.nasa.gov/wms.cgi \
	output=wms_global_mosaic
	# export the data to VTK
	r.out.vtk rgbmaps=wms_global_mosaic.red,wms_global_mosaic.green,wms_global_mosaic.blue \
	elevation=elevation.10m output=/tmp/out.vtk
	# visualize in Paraview or other VTK viewer:
	paraview --data=/tmp/out.vtk
	</pre></div>

Expected behavior

Docs replaced with a working example.

I think the closest I got to the current web servers are listed here https://nasa-gibs.github.io/gibs-api-docs/access-basics/#ogc-web-map-service-wms

Other

Other links:
https://www.earthdata.nasa.gov/engage/open-data-services-software/earthdata-developer-portal/gibs-api
https://neo.gsfc.nasa.gov/about/wms.php
https://web.archive.org/web/20090703225229/http://wms.jpl.nasa.gov/wms.cgi