Doc for vSphere provider

[changxiaohui]

Co-authored-by: Yixing Jia yixingjia@gmail.com
Co-authored-by: YongChun Chang changsang91@163.com
Co-authored-by: Shiqi He johnhsq@126.com

Sign-off-by: Yongchun Chang changsang91@163.com

[Michaelvll]

Thank you for submitting the docs for vsphere @changxiaohui! Left several comments. We would also like to change the hint in sky check to refer to the docs as well:

            return False, (
                'vSphere dependencies are not installed. '
                'Run the following commands:'
                f'\n{cls._INDENT_PREFIX}  $ pip install skypilot[vSphere]'
                f'\n{cls._INDENT_PREFIX}Credentials may also need to be set. '
                'For more details. See https://skypilot.readthedocs.io/en/latest/getting-started/installation.html#vmware-vsphere'
                f'\n{cls._INDENT_PREFIX}{common_utils.format_exception(e, use_bracket=True)}')

For the place:

skypilot/sky/clouds/vsphere.py

Lines 260 to 266 in f78a16e

	return False, (
	'vSphere dependencies are not installed. '
	'Run the following commands:'
	f'\n{cls._INDENT_PREFIX} $ pip install skypilot[vSphere]'
	f'\n{cls._INDENT_PREFIX}Credentials may also need to be set. '
	f'{common_utils.format_exception(e, use_bracket=True)}')

[Michaelvll]

Thanks for adding the doc @changxiaohui! It looks mostly good to me. It should good to go after the following comments are fixed.