Before I upgraded Xcode and the iOS SDk to 3.2.5 and 4.2 respectively I could select text in Xcode, right click and and select find text in documentation, and it would go to the corresponding place in the documentation, however now if I do that it asks me to sign in with my apple ID, and then it tells me I'm not authorized? However I can access the documentation in a normal web browser like chrome, it's just irritating to not have the convenience of selecting and right clicking. (NB I'm not a paying developer, but I never have been)
Why is this? Is it only me? and how do I fix it?
Here's a hacky but working fix, inspired by http://www.iphonedevsdk.com/forum/iphone-sdk-tools-utilities/66298-unable-access-sdk-documentation-since-upgrade.html:
Open the file /Developer/Platforms/iPhoneOS.platform/Developer/Documentation/DocSets/com.apple.adc.documentation.AppleiOS4_2.iOSLibrary.docset/Contents/Info.plist
Change the DocSetFallbackURL value from https://developer.apple.com/library/ios/prerelease to http://developer.apple.com/library/ios/.
Relaunch Xcode, and voilà.
If you open the URL from DocSetFeedURL (in the same Info.plist) in Safari, you can download a .xar file of the documentation. Not sure what that file is, but I'm currently downloading it...