Docs: Added documentation for .retry and .timeout for helpers

[steventhanna]

Added documentation for .retry and .timeout for helpers as found in the following locations:

• Internal Fleet.dm Code
• Sails Changelog
• .timeout in Parley

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[steventhanna]

Hi @rachaelshaw and @eashaw, was wondering if this needed any further review, hoping to get this merged out to the docs site at some point since this was a cool feature not documented anywhere except in some release notes.

[steventhanna]

@rachaelshaw @eashaw @mikermcneil bump for help merging improved docs on undocumented features (helpers .retry() and .timeout()

[DominusKelvin]

Hey @eashaw do you think we can move this forward for merging?

[haastrupea]

I have been looking for this. Thank you so much @DominusKelvin for pointing it out. I wonder why it's not merged yet