Documented how to connect to physical iOS device
Documented how to connect to physical iOS device

Summary: Updated outdated docs are reported in https://github.com/facebook/flipper/issues/1250

Reviewed By: priteshrnandgaonkar

Differential Revision: D27361276

fbshipit-source-id: 87bede49501d6ae7d2a9612b769e1e1c1d7803b1

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