fix(kubernetes): syntax for custom completions - <shape>@<completer>

[ryan4yin]

Error: nu::parser::unclosed_delimiter

  × Unclosed delimiter.
   ╭─[/nix/store/2vdywiymhxd8dl4xfflpix5nrpky6b2i-source/modules/kubernetes/resources.nu:6:17]
 5 │     ...namespace: string@"nu-complete kube ns"
 6 │     --kind(-k): list<string@"nu-complete kube kind">
   ·                 ─────┬─────
   ·                      ╰── unclosed >
 7 │ ] {
   ╰────

[fdncred]

Thanks