Support the change of did_you_mean about Exception#detailed_message
#5560
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I am asking did_you_mean to use Exception#detailed_message to add
"Did you mean?" suggestion instead of overriding #message method.
ruby/did_you_mean#177
Unfortunately, the change will affect Gem::UnknownCommandError, which
excepts did_you_mean to override #message method.
This PR absorbs the change of did_you_mean.
Gem::CommandManager now calls #detailed_message method to get a message
string with "Did you mean?" suggestion from an exception.
What was the end-user or developer problem that led to this PR?
What is your fix for the problem, implemented in this PR?
Make sure the following tasks are checked