Documentation: Adhere to the tldr client specifications

[Managor]

tldr uses custom syntax {{ }} and {{[ ]}} which are meant to be interpretted client side. See the specifications here https://github.com/tldr-pages/tldr/blob/main/CLIENT-SPECIFICATION.md#page-structure.

When the pages are displayed raw, the placehorder syntax creates unnecessary clutter in the pages which might confuse new users. See cp for a good example https://uutils.github.io/coreutils/docs/utils/cp.html#examples