Clarify BUNDLE_USER_CONFIG is a file

[dkav]

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

Documentation is not explicit that BUNDLE_USER_CONFIG sets a file not a directory.

I assumed that BUNDLE_USER_CONFIG was a path to where the config file was to be saved. But I found out that if export BUNDLE_USER_CONFIG=$XDG_CONFIG_HOME/bundle is defined in my profile Bundler will create a file called bundle in the $XDG_CONFIG_HOME folder.

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

A slight modification to the relevant documentation. More could be added if deemed necessary.

Make sure the following tasks are checked

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

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[deivid-rodriguez]

Great, thanks!

[deivid-rodriguez]

You need to run bin/rake man:build and commit the result so that the man page is also updated.

[dkav]

Ok. The change was made on GitHub but I cloned, ran the script and amended the commit with the updated man page.

[deivid-rodriguez]

Thank you so much!