Add context information for jobs.<job_id>.uses

As far as I can tell, this property does not have access to any context and needs to be a statically defined string. If this is incorrect, it'd be great to have some clarification here.

content/actions/writing-workflows/choosing-what-your-workflow-does/accessing-contextual-information-about-workflow-runs.md

@@ -123,6 +123,7 @@ The following table indicates where each context and special function can be use
 | `jobs.<job_id>.steps.working-directory` | `github, needs, strategy, matrix, job, runner, env, vars, secrets, steps, inputs` | `hashFiles` |
 | `jobs.<job_id>.strategy` | `github, needs, vars, inputs` | None |
 | `jobs.<job_id>.timeout-minutes` | `github, needs, strategy, matrix, vars, inputs` | None |
+| `jobs.<job_id>.uses` | None | None |
 | `jobs.<job_id>.with.<with_id>` | `github, needs, strategy, matrix, inputs, vars` | None |
 | `on.workflow_call.inputs.<inputs_id>.default` | `github, inputs, vars` | None |
 | `on.workflow_call.outputs.<output_id>.value` | `github, jobs, vars, inputs` | None |