docs: use compliant name in Generators-List.md

s/elementsYaml/elements-yaml/

Fixes issue:

The ApplicationSet "elementsYaml" is invalid: metadata.name: Invalid value: "elementsYaml": a lowercase
RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and
end with an alphanumeric character (e.g. 'example.com', regex used for validation is
'[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

argoproj / argo-cd

docs: use compliant name in Generators-List.md #18062