Add a few missing tracking issues in Configurations.md

[karyon]

Follow-up to #5052.

I went through all the unstable opts in Configurations.md, reopened some existing tracking issues, and created new ones where necessary.

I also verified the stable yes/no annotations actually match the code, they did.

I noticed the following options from the code do not appear in configurations.md, @calebcartwright let me know whether that should be changed.

• file_lines ("Lines to format; this is not supported in rustfmt.toml and can only be specified via the --file-lines option")
• newline_style ("Unix or Windows line endings")
• verbose ("How much to information to emit to the user")
• width_heuristics ("'small' heuristic values")

[calebcartwright]

Thank you!

I noticed the following options from the code do not appear in configurations.md, @calebcartwright let me know whether that should be changed

No that's fine, they are excluded explicitly because they are command-line only options, with the exception of width_heuristics which was a 2.x only target as a simple rename of the existing use_small_heuristics