Remove experimental function link

[texascloud]

https://github.com/fission/fission-workflows/blob/master/Docs/functions.md#repeat

A complete example of this function can be found in the repeatwhale example.

repeatwhale points to https://github.com/fission/fission-workflows/blob/master/examples/whales/repeatwhale.wf.yaml which doesn't exist

[erwinvaneyk]

Hey @CamelCaseNotation - thanks for mentioning this! Do you want to PR a fix this yourself?