Update azr docs for udr egw - #3107

[vale] reported by reviewdog 🐶 [Vale.Terms] Use 'Tigera Operator' instead of 'Tigera operator'. Raw Output: {"message":"[Vale.Terms] Use 'Tigera Operator' instead of 'Tigera operator'.","location":{"path":"calico-enterprise/networking/egress/egress-gateway-azure-udr.mdx","range":{"start":{"line":72,"column":79},"end":{"line":72,"column":94}}},"severity":"WARNING","code":{"value":"Vale.Terms"}}