[rubygems/rubygems] Remove misleading comments

`site_dir`, or `vendor_dir`, is the location where the default version
of bundler & rubygems gets installed. These folders are placed directly
in the LOAD_PATH, so they cannot hold any nested gem directory
structure. So a single copy of either rubygems or bundler can be placed
in these folders.

What the tests are actually testing is the TODO comment that I'm
removing: that installing the default copy of bundler doesn't affect any
already installed copies of bundler as regular gems.

https://github.com/rubygems/rubygems/commit/7ca8831d72

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