docs: correct default authfile path

[wulfgarpro]

/kind documentation

None

[TomSweeneyRedHat]

In other places I'm seeing the default is /run/containers/$UID/auth.json in the man pages. I think you might have found something that needs fixing in several places. @rhatdan thoughts?

[rhatdan]

grep "/run/containers/.*UID/auth.json" . -r
./docs/buildah-push.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.
./docs/buildah-commit.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.
./docs/buildah-from.1.md:  An image in a registry implementing the "Docker Registry HTTP API V2". By default, uses the authorization state in `$XDG_RUNTIME_DIR/containers/auth.json`, which is set using `(buildah login)`.  If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. If the authorization state is not found there, `$HOME/.docker/config.json` is checked, which is set using `(docker login)`.
./docs/buildah-from.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.
./docs/buildah-login.1.md:is not set, the default is /run/containers/$UID/auth.json.
./docs/buildah-logout.1.md:The default path used is **${XDG\_RUNTIME_DIR}/containers/auth.json**.  If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json.
./docs/buildah-manifest-add.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.
./docs/buildah-pull.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.
./docs/buildah-build.1.md:Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. If XDG_RUNTIME_DIR is not set, the default is /run/containers/$UID/auth.json. This file is created using `buildah login`.

[wulfgarpro]

It's also still a contradiction for root where buildah login XXX puts auth.json at /run/containers/0/auth.json. I'll fix it up when I have a spare moment. Is this documentation generated?

[flouthoc]

LGTM

[openshift-ci]

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[rhatdan]

Documentation (Markdown) is not generated, it is hand edited.