Fix typos in comments/javadoc

src/components/src/main/java/org/apache/jmeter/reporters/MailerModel.java

@@ -281,7 +281,7 @@ public String toString() {
      * @param from
      *            the sender of the mail as shown in the mail-client.
      * @param vEmails
-     *            all receivers of the mail. The receivers are seperated by
+     *            all receivers of the mail. The receivers are separated by
      *            commas.
      * @param subject
      *            the subject of the mail.
@@ -305,7 +305,7 @@ public void sendMail(String from, List<String> vEmails, String subject, String a
      * @param from
      *            the sender of the mail as shown in the mail-client.
      * @param vEmails
-     *            all receivers of the mail. The receivers are seperated by
+     *            all receivers of the mail. The receivers are separated by
      *            commas.
      * @param subject
      *            the subject of the mail.

src/core/src/main/java/org/apache/jmeter/report/dashboard/ReportGenerator.java

@@ -511,7 +511,7 @@ private static AggregateConsumer createEndDateConsumer() {
     }
 
     /**
-     * @return Consumer that compute the begining date of the test
+     * @return Consumer that compute the beginning date of the test
      */
     private static AggregateConsumer createBeginDateConsumer() {
         AggregateConsumer beginDateConsumer = new AggregateConsumer(

src/functions/src/main/java/org/apache/jmeter/functions/RandomDate.java

@@ -50,7 +50,7 @@
  * <ul>
  *  <li>Time format @see <a href="https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html">DateTimeFormatter</a>
  *      (optional - defaults to yyyy-MM-dd)</li>
- *  <li>Start date formated as first param (optional - defaults to now)</li>
+ *  <li>Start date formatted as first param (optional - defaults to now)</li>
  *  <li>End date</li>
  *  <li>Locale for the format (optional)</li>
  *  <li>variable name (optional)</li>