docs: remove backtick code spans from table headers in supervision and platform-support

Author: ZelAnton

docs/platform-support.md

@@ -19,7 +19,7 @@ matrices and fine print in one place.
 
 `ProcessGroup::mechanism()` reports which one you actually got:
 
-| `Mechanism` | Platform | How containment works |
+| Mechanism | Platform | How containment works |
 |---|---|---|
 | `JobObject` | Windows | A Job Object with kill-on-close; children are created suspended, assigned to the job, then resumed — so even a grandchild forked in the first instant is contained |
 | `CgroupV2` | Linux (with delegation) | A private cgroup; children join in `pre_exec`, before `exec`, so descendants can never escape; teardown is `cgroup.kill` |

docs/supervision.md

@@ -57,7 +57,7 @@ which honors the command's `ok_codes`): an exit code outside the accepted set
 `ok_codes([0, 2])` that exits `2` is a success, so `OnCrash` treats it as clean,
 not a crash.
 
-| `RestartPolicy` | Restarts after… |
+| RestartPolicy | Restarts after… |
 |---|---|
 | `OnCrash` *(default)* | crashes only; a clean exit ends supervision (`PolicySatisfied`) |
 | `Always` | every completed run, clean or not — pair it with `stop_when`/`max_restarts` or it loops forever |