Bring docs for gemfile(5) manpage up to date

[tnir]

What was the end-user or developer problem that led to this PR?

gemfile(5) manpage in Bundler is stale.

What is your fix for the problem, implemented in this PR?

• Use updated Ruby/JRuby versions as examples as the current Bundler supports Ruby 2.3+.
• Add mswin/mswin64 to platforms
• Use TruffleRuby as example instead of Rubinius

Signed-off-by: Takuya Noguchi takninnovationresearch@gmail.com

Make sure the following tasks are checked

• Describe the problem / feature
• [n/a] Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

[tnir]

@deivid-rodriguez Could you check it out as the failed check on Actions looks irrelevant to this change to me.

[indirect]

Thanks, this is great!

Since Bundler 2 requires a minimum Ruby version of 2.3.0, it seems like we can remove the docs (and I suppose also the implementation?) for the patchlevel: argument for the ruby DSL method.

[tnir]

Since Bundler 2 requires a minimum Ruby version of 2.3.0, it seems like we can remove the docs (and I suppose also the implementation?) for the patchlevel: argument for the ruby DSL method.

I do not think at this moment we can remove this section from the docs since you know the implementation of patchlevel keyword argument for ruby DSL method in Gemfile. First, with this PR, we can update how it currently works and then we can remove implementation later and finally remove the doc for it.

[tnir]

#6012 was just created to discuss how we can deprecate/remove this legacy feature.

[deivid-rodriguez]

@tnir Can I merge this? I think that you force-pushed after my approval, so just wanted to make sure that it's ready.

[tnir]

@deivid-rodriguez Yes, please merge this PR. Just rebased the branch as you did not merge it after your approval 🙏