xla

09844348 - Cherry-pick doc updates for PJRT to r2.0 (#4769)

Cherry-pick doc updates for PJRT to r2.0 (#4769) * Cherry-pick doc updates for PJRT * Add detail about PJRT performance to `pjrt.md` (#4780) * Add detail about PJRT performance * Fix link to TFRT vs SE * Typo and wording