Improved build error output

* [gym] Improve build error output to be more clear (#9727) via Felix Krause
* Fix grammer mistakes in docs (#9731) via Justin Swart
* Fix markdown formating in iTunesConnect (#9725) via Eugene Oskin
* add the word 'you' that was missing (#9713) via Tim Myers

This release will make it easier to see the raw `xcodebuild` error message when something goes wrong during code ssigning or building your app :rocket:

https://github.com/fastlane/fastlane/releases/tag/2.46.1
