[BugFix] Drop issue-link reference from regression-test JavaDoc (#5488)

Per maintainer review feedback, the regression-test JavaDoc for testDedupAfterWhereProducesLogicalDedup mentioned the originating issue URL. The remaining JavaDoc paragraphs already describe the bug shape and the rule-ordering invariant, so the explicit issue link is unnecessary noise.

Signed-off-by: ryan-gh-bot <ryan-gh-bot@users.noreply.github.com>

Author: ryan-gh-bot

ppl/src/test/java/org/opensearch/sql/ppl/calcite/CalcitePPLDedupTest.java

@@ -361,9 +361,7 @@ public void testSortFieldProjectedAwayBeforeDedup() {
   }
 
   /**
-   * Regression test for https://github.com/opensearch-project/sql/issues/5482
-   *
-   * <p>When a user {@code where} precedes {@code dedup}, the user filter sits adjacent to the
+   * When a user {@code where} precedes {@code dedup}, the user filter sits adjacent to the
    * bucket-non-null filter that PPL emits for the dedup pattern. The HEP optimizer must run {@link
    * PPLSimplifyDedupRule} before {@link FilterMergeRule}; otherwise the merged condition breaks the
    * simplify-rule's operand match and dedup falls through to the in-memory {@code ROW_NUMBER}