Update ingress-path-matching.md (#11007)

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## Regular Expression Support
!!! important
Regular expressions and wild cards are not supported in the `spec.rules.host` field. Full hostnames must be used.
Regular expressions is not supported in the `spec.rules.host` field. The wildcard character '*' must appear by itself as the first DNS label and matches only a single label. You cannot have a wildcard label by itself (e.g. Host ==
"*").
!!! note
Please see the [FAQ](../faq.md#validation-of-path) for Validation Of __`path`__