Update Install Twitter Kit Manually documentation

[Yeanuganti]

Need to update Install Twitter Kit Manually documentation

Expected behavior

Just adding TwitterKit and TwitterCore to "Linked Frameworks and Libraries" in your Xcode project settings should work and no need to Add TwitterKit to "Embedded Binaries" in your Xcode project settings.

Actual behavior

Adding TwitterKit to "Embedded Binaries" in your Xcode project settings causes unexpected Mach-O header code: 0x72613c21.

Steps to reproduce the behavior

Please list all relevant steps to reproduce the observed behavior.

[Radar966]

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