I\'ve read a few posts on how to install the missing documentation on Xcode 4.2 by going into the documents manager and downloading it directly. Other questions suggest me t
Here you are the steps:
Download the documentation from Xcode from any machine.
Go the download installation (See Figure Below)
Copy the "documentation set" files (it is actually packages with a lot of file so it is recommend to zip them).
Move them to the same location where you installed Xcode on the other machines
Restart Xcode.
Done.
How to download documentation file online - If you are connected to Internet you can download the documentation file. Go to Xcode -> Preferences -> Downloads (this is the screen I attached). Here you will find iOS 4.3 Library in listing and and button on right "Install". Just Click the button "Install" for the items you want to download.
After documentation download you can see its path and copy the files to other systems. Hope it clears your question completely.. if not please post in comments.
Edited
As I am still getting upvotes on this answer I thought its better to post some links to download new SDK's documentations.
iOS SDK 5.1 - https://developer.apple.com/rss/com.apple.adc.documentation.AppleiPhone5_1.atom
iOS SDK 6.0 - https://developer.apple.com/rss/com.apple.adc.documentation.AppleiPhone6.0.atom
Mac OS X 10.6 core library - https://developer.apple.com/rss/com.apple.adc.documentation.AppleSnowLeopard.atom
Mac OSX 10.8 - https://developer.apple.com/rss/com.apple.adc.documentation.AppleOSX10_8.atom
Xcode 4.0+ developer library - https://developer.apple.com/rss/com.apple.adc.documentation.AppleXcode4_0.atom