Nikhil/docslinkfix

[nikhilchauhangithub]

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broken link fixed on hypertext "KubeEdge Documentation" and "Setup KubeEdge"
issue #391

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[nikhilchauhangithub]

@dingyin @Shelley-BaoYue @fisherxu kindly review this pr, here i fix two broken links.

[kevin-wangzefeng]

Duplicated with #373

[kubeedge-bot]

@nikhilchauhangithub: PR needs rebase.

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[stale]

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