Fix call angular.isUndefined in $cacheFactory doc

[idoo]

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[idoo]

@googlebot I signed it!

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CLAs look good, thanks!

[Narretz]

These functions are usually available without angular while in the main angular closure. Did you experience them being undefined?

[Narretz]

Oh I see now it's in the docs. Never mind my comment then.

[gkalpak]

@Narretz, the code belongs to an example (in the docs), so it is needed.

[idoo]

@gkalpak it's not working in current version
https://docs.angularjs.org/api/ng/service/$cacheFactory

[Narretz]

Thx @gkalpak. Would also be nice to backport this to 1.4.

[Narretz]

@idoo You have to give Travis about 20 minutes to complete the tests etc. Only then is the site updated.

[gkalpak]

Backported to v1.4.x as 808f984.