Fix illegal Javadoc tags (Java 17)
diff --git a/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/analysis/polynomials/PolynomialFunctionTest.java b/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/analysis/polynomials/PolynomialFunctionTest.java
index 7bc78b6..9da4989 100644
--- a/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/analysis/polynomials/PolynomialFunctionTest.java
+++ b/commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/analysis/polynomials/PolynomialFunctionTest.java
@@ -56,8 +56,8 @@
*
* <p>This will test the function f(x) = 3*x - 1.5</p>
* <p>This will have the values
- * <tt>f(0) = -1.5, f(-1) = -4.5, f(-2.5) = -9,
- * f(0.5) = 0, f(1.5) = 3</tt> and {@code f(3) = 7.5}
+ * <code>f(0) = -1.5, f(-1) = -4.5, f(-2.5) = -9,
+ * f(0.5) = 0, f(1.5) = 3</code> and {@code f(3) = 7.5}
* </p>
*/
@Test
