[MINOR][SQL][DOCS] Correct the 'options' description on UnresolvedRel…

…ation

### What changes were proposed in this pull request?

This PR fixes the 'options' description on `UnresolvedRelation`. This comment was added in apache#29535 but not valid anymore because V1 also uses this `options` (and merge the options with the table properties) per apache#29712.

This PR can go through from `master` to `branch-3.1`.

### Why are the changes needed?

To make `UnresolvedRelation.options`'s description clearer.

### Does this PR introduce _any_ user-facing change?

No, dev-only.

### How was this patch tested?

Scala linter by `dev/linter-scala`.

Closes apache#34075 from HyukjinKwon/minor-comment-unresolved-releation.

Authored-by: Hyukjin Kwon <gurwls223@apache.org>
Signed-off-by: Huaxin Gao <huaxin_gao@apple.com>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala

@@ -40,7 +40,7 @@ class UnresolvedException(function: String)
  * Holds the name of a relation that has yet to be looked up in a catalog.
  *
  * @param multipartIdentifier table name
- * @param options options to scan this relation. Only applicable to v2 table scan.
+ * @param options options to scan this relation.
  */
 case class UnresolvedRelation(
     multipartIdentifier: Seq[String],