Add documentation link for Vacuum Protocol Check (#3041)

#### Which Delta project/connector is this regarding?
- [ ] Spark
- [ ] Standalone
- [ ] Flink
- [ ] Kernel
- [ ] Other (fill in here)

## Description

Add documentation link for Vacuum Protocol Check spec
Backport of #3029

docs/source/versioning.md

@@ -107,6 +107,7 @@ The following table shows minimum protocol versions required for <Delta> feature
    Timestamp without Timezone,7,3,[TimestampNTZType](https://spark.apache.org/docs/latest/sql-ref-datatypes.html)
    Iceberg Compatibility V1,7,2,[IcebergCompatV1](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#iceberg-compatibility-v1)
    V2 Checkpoints,7,3,[V2 Checkpoint Spec](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#v2-spec)
+   Vacuum Protocol Check,7,3,[Vacuum Protocol Check Spec](https://github.com/delta-io/delta/blob/master/PROTOCOL.md#vacuum-protocol-check)
    Type widening (Preview),7,3,[_](/delta-type-widening.md)
 
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