8191632: Typos in comments due to duplicating words

Reviewed-by: alanb

src/java.base/share/classes/java/lang/ModuleLayer.java

@@ -766,7 +766,7 @@ public final class ModuleLayer {
 
 
     /**
-     * Returns an ordered stream of layers. The first element is is this layer,
+     * Returns an ordered stream of layers. The first element is this layer,
      * the remaining elements are the parent layers in DFS order.
      *
      * @implNote For now, the assumption is that the number of elements will

src/java.base/share/classes/java/lang/StackTraceElement.java

@@ -293,7 +293,7 @@ public final class StackTraceElement implements java.io.Serializable {
      * <li>
      *     "{@code acme@2.1/org.acme.Lib.test(Lib.java:80)}"
      * - The class of the execution point is defined in {@code acme} module
-     * loaded by by a built-in class loader such as the application class loader.
+     * loaded by a built-in class loader such as the application class loader.
      * </li>
      * <li>
      *     "{@code MyClass.mash(MyClass.java:9)}"

src/java.base/share/classes/java/lang/module/ModuleDescriptor.java

@@ -1593,7 +1593,7 @@ public class ModuleDescriptor
         /**
          * Adds a dependence on a module with the given (and possibly empty)
          * set of modifiers. The dependence includes the version of the
-         * module that that was recorded at compile-time.
+         * module that was recorded at compile-time.
          *
          * @param  ms
          *         The set of modifiers

src/java.base/share/classes/java/lang/module/Resolver.java

@@ -217,7 +217,7 @@ final class Resolver {
     Resolver bind() {
 
         // Scan the finders for all available service provider modules. As
-        // java.base uses services then then module finders will be scanned
+        // java.base uses services then the module finders will be scanned
         // anyway.
         Map<String, Set<ModuleReference>> availableProviders = new HashMap<>();
         for (ModuleReference mref : findAll()) {

src/java.base/share/classes/java/math/BigInteger.java

@@ -2741,7 +2741,7 @@ public class BigInteger extends Number implements Comparable<BigInteger> {
          return z;
     }
 
-    // These methods are intended to be be replaced by virtual machine
+    // These methods are intended to be replaced by virtual machine
     // intrinsics.
     @HotSpotIntrinsicCandidate
     private static int[] implMontgomeryMultiply(int[] a, int[] b, int[] n, int len,