Update the P4Runtime-Spec to remove whitespace.

Signed-off-by: Author Name <[email protected]>

docs/v1/P4Runtime-Spec.mdk

@@ -4569,7 +4569,7 @@ semantics.
  return `INVALID_ARGUMENT`. The `metadata` field is an arbitrary `bytes` value
  which is opaque to the target. There is no requirement of where this is
  stored, but it must be returned by the server along with the rest of the entry
- when the client performs a read on the entry. The `fallback_ports` field 
+ when the client performs a read on the entry. The `fallback_ports` field.
 * `MODIFY`: Modify the set of replicas and metadata for a given multicast group
  entry, indexed by the given `multicast_group_id`. Same restrictions as
  `INSERT` apply here.