Follow-up from "Change "Boolean" to lowercase in docs"

The following discussions from !26361 (merged) should be addressed:

• @eread started a discussion:

  | `platform_kubernetes_attributes[ca_cert]` | string | no | TLS certificate. Needed if API is using a self-signed TLS certificate |

  Missing bracket (legacy content problem). This is how I'd solve it.

• @eread started a discussion:

  | `platform_kubernetes_attributes[ca_cert]` | string | no | TLS certificate. Needed if API is using a self-signed TLS certificate |

  Missing bracket (legacy content problem). This is how I'd solve it.

• @eread started a discussion:

  A few instances of String here also.