r.out.vtk: replace dead WMS server with NASA GIBS WMS in docs (#4844)

[rohannallamadge]

This pull request updates the example in the r.out.vtk documentation. The previous WMS server (http://wms.jpl.nasa.gov/wms.cgi) is no longer available, causing the example to fail.

Changes made:

Replaced the dead WMS server with NASA GIBS WMS (https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi).
Used the BlueMarbleNG layer for global imagery, which closely matches the original intent of the example.

[pesekon2]

When I try the new example, I get the following error:

> r.in.wms layers=BlueMarbleNG mapserver=https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi?       output=wms_BlueMarbleNG
ERROR: WMS server error: b'<?xml version=\'1.0\' encoding="UTF-8"
       standalone="no" ?>\n<!DOCTYPE ServiceExceptionReport SYSTEM
       "http://schemas.opengis.net/wms/1.1.1/exception_1_1_1.dtd">\n<ServiceExceptionReport
       version="1.1.1">\n<ServiceException
       code="LayerNotDefined">\nmsWMSLoadGetMapParams(): WMS server error.
       Invalid layer(s) given in the LAYERS parameter. A layer might be
       disabled for this request. Check wms/ows_enable_request
       settings.\n</ServiceException>\n</ServiceExceptionReport>\n'

[petrasovaa]

Please remove unrelated changes from this PR

[pesekon2]

Please remove unrelated changes from this PR

@rohannallamadge: They were introduced in 90ba339 - it should be sufficient to revert the commit. As the changes were not there yesterday when I was making the review, I guess they slipped in together with your merge request.

[pesekon2]

When I try the new example, I get the following error:

> r.in.wms layers=BlueMarbleNG mapserver=https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi?       output=wms_BlueMarbleNG
ERROR: WMS server error: b'<?xml version=\'1.0\' encoding="UTF-8"
       standalone="no" ?>\n<!DOCTYPE ServiceExceptionReport SYSTEM
       "http://schemas.opengis.net/wms/1.1.1/exception_1_1_1.dtd">\n<ServiceExceptionReport
       version="1.1.1">\n<ServiceException
       code="LayerNotDefined">\nmsWMSLoadGetMapParams(): WMS server error.
       Invalid layer(s) given in the LAYERS parameter. A layer might be
       disabled for this request. Check wms/ows_enable_request
       settings.\n</ServiceException>\n</ServiceExceptionReport>\n'

Even after 27412da that I would expect to be a fix, I am getting the same error.

[pesekon2]

Suggested change

	r.in.wms layers=BlueMarbleNG url=https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi? \
	r.in.wms layers=BlueMarble_NextGeneration url=https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi? \

[pesekon2]

The computational region should be changed to follow the region and coordinate system of the WMS used. The same applies to the title -- it is not Spearfish example with RGB data anymore.

[pesekon2]

@rohannallamadge: What was the meaning of the last commit? It seems that the only effect is that the unrelated changes in python/grass/jupyter slipped again in in 781db51

[rohannallamadge]

sir @pesekon2 Apologies for the confusion regarding the last commit. The issue arose because my OneDrive integration caused unintended changes to be merged automatically into the gh-phase branch.

To resolve this and ensure a clean contribution, I have created a new branch Mercator and submitted another PR with only the relevant changes.

[petrasovaa]

Continued in #4897