Rollup merge of #144811 - jieyouxu:target-maintainer-docs, r=Noratrieb

Stylize `*-lynxos178-*` target maintainer handle to make it easier to copy/paste

Apparently I forgot to submit this branch I had lying around.

Noticed while reviewing Tier 3 target platform support pages. In the same style as rust-lang/rust#139028.

Author: Zalathar