fix(docs): Change `dir` and `file` variable names ...

[LeoniePhiline]

fix(docs): Change dir and file variable names in tempdir and tempdir_in documentation

to match existing comments and rest of module

Problem statement

The documentation for tempdir and tempdir_in use variables dir and file but refer to them as tmp_dir and tmp_file in code comments.

Discussion

The comments could be changed to refer to dir and file. However, the rest of the module uses tmp_dir and tmp_file.

PR changes

The variable names were changed.

This way, they match the comments referring to these variables as well as the rest of the module documentation.

Tests

Existing doctests succeed.

test src/dir.rs - dir::tempdir (line 36) ... ok
test src/dir.rs - dir::tempdir_in (line 85) ... ok

[LeoniePhiline]

It's not a big deal - it's just correcting something that's wrong.

Even if it being wrong does no further harm than to trip the occasional reader's brain for a second.

Sometimes it's the small things. ;)

[Stebalien]

No, thank you. It does make for cleaner docs.