Update README.md (#7638)
Update README.md (#7638)

* Update README.md

<VCENTER_HOSTNAME> cannot be found in the example sample_vsphere.d/conf.yaml

* Update README.md

* Update vsphere/README.md

Co-authored-by: Ofek Lev <8bbe81b7cc931ef327af3b7c5f7a3c24e9e921f7@gmail.com>

Co-authored-by: cswatt <68dd74d5464d42706afe3175604ae6dd0529cacd@datadoghq.com>
Co-authored-by: Grégoire Marabout <f100ec85ec25ddd4438e683bddb54723feef82b6@datadoghq.com>
Co-authored-by: Ofek Lev <8bbe81b7cc931ef327af3b7c5f7a3c24e9e921f7@gmail.com>
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core