lib.path: Indent comments the same

in /* No rec! Add dependencies on this file at the top. */ {

  /* Append a subpath string to a path.

  /*

    Append a subpath string to a path.

    Like `path + ("/" + string)` but safer, because it errors instead of returning potentially surprising results.

    More specifically, it checks that the first argument is a [path value type](https://nixos.org/manual/nix/stable/language/values.html#type-path"),

      subpath = joinRelPath deconstructed.components;

    };

  /* Whether a value is a valid subpath string.

  /*

    Whether a value is a valid subpath string.

    A subpath string points to a specific file or directory within an absolute base directory.

    It is a stricter form of a relative path that excludes `..` components, since those could escape the base directory.

    subpathInvalidReason value == null;

  /* Join subpath strings together using `/`, returning a normalised subpath string.

  /*

    Join subpath strings together using `/`, returning a normalised subpath string.

    Like `concatStringsSep "/"` but safer, specifically:

          ${subpathInvalidReason subpath}'';

    splitRelPath subpath;

  /* Normalise a subpath. Throw an error if the subpath isn't [valid](#function-library-lib.path.subpath.isValid).

  /*

    Normalise a subpath. Throw an error if the subpath isn't [valid](#function-library-lib.path.subpath.isValid).

    - Limit repeating `/` to a single one.