Fix duplicate "the" in Javadoc comments

Removes occurrences of "the the" in Javadoc comments in the following files:
- oauth2_http/java/com/google/auth/oauth2/OAuth2Credentials.java
- oauth2_http/java/com/google/auth/oauth2/ServiceAccountJwtAccessCredentials.java
- oauth2_http/java/com/google/auth/oauth2/JwtCredentials.java

Author: google-labs-jules[bot]

oauth2_http/java/com/google/auth/oauth2/JwtCredentials.java

@@ -140,7 +140,7 @@ private boolean shouldRefresh() {
   /**
    * Returns a copy of these credentials with modified claims.
    *
-   * @param newClaims new claims. Any unspecified claim fields default to the the current values.
+   * @param newClaims new claims. Any unspecified claim fields default to the current values.
    * @return new credentials
    */
   @Override

oauth2_http/java/com/google/auth/oauth2/OAuth2Credentials.java

@@ -574,7 +574,7 @@ public void onFailure(Throwable throwable) {
   /**
    * Result from {@link com.google.auth.oauth2.OAuth2Credentials#getOrCreateRefreshTask()}.
    *
-   * <p>Contains the the refresh task and a flag indicating if the task is newly created. If the
+   * <p>Contains the refresh task and a flag indicating if the task is newly created. If the
    * task is newly created, it is the caller's responsibility to execute it.
    */
   static class AsyncRefreshResult {

oauth2_http/java/com/google/auth/oauth2/ServiceAccountJwtAccessCredentials.java

@@ -336,7 +336,7 @@ public JwtCredentials load(JwtClaims claims) throws Exception {
   /**
    * Returns a new JwtCredentials instance with modified claims.
    *
-   * @param newClaims new claims. Any unspecified claim fields will default to the the current
+   * @param newClaims new claims. Any unspecified claim fields will default to the current
    *     values.
    * @return new credentials
    */