Fix spelling in Javadoc

Author: garydgregory

commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/fitting/leastsquares/StatisticalReferenceDataset.java

@@ -233,7 +233,7 @@ public int getNumParameters() {
     }
 
     /**
-     * Returns the certified values of the paramters.
+     * Returns the certified values of the parameters.
      *
      * @return the values of the parameters
      */

commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/fitting/leastsquares/StatisticalReferenceDatasetFactory.java

@@ -38,7 +38,7 @@ private StatisticalReferenceDatasetFactory() {
      *
      * @param name the name of the resource
      * @return a buffered reader
-     * @throws IOException if an I/O error occured
+     * @throws IOException if an I/O error occurred
      */
     public static BufferedReader createBufferedReaderFromResource(final String name)
         throws IOException {

commons-math-legacy/src/test/java/org/apache/commons/math4/legacy/optim/nonlinear/scalar/noderiv/PowellOptimizerTest.java

@@ -198,7 +198,7 @@ public double value(double[] x) {
         final double funcScaledValue = funcScaled.value(funcScaledResult.getPoint());
         final int funcScaledEvaluations = optim.getEvaluations();
 
-        // Check that both minima provide the same objective funciton values,
+        // Check that both minima provide the same objective function values,
         // within the relative function tolerance.
         Assert.assertEquals(1, funcScaledValue / (scale * funcValue), relTol);