docs(logs): clarify setTimestamp javadoc for event timestamp behavior (#8104)

Co-authored-by: Jack Berg <34418638+jack-berg@users.noreply.github.com>

Author: ruturajjadhav07

api/all/src/main/java/io/opentelemetry/api/logs/LogRecordBuilder.java

@@ -31,16 +31,14 @@ public interface LogRecordBuilder {
   /**
    * Set the epoch {@code timestamp}, using the timestamp and unit.
    *
-   * <p>The {@code timestamp} is the time at which the log record occurred. If unset, it will be set
-   * to the current time when {@link #emit()} is called.
+   * <p>Note: If not set, the emitted log will not have a timestamp.
    */
   LogRecordBuilder setTimestamp(long timestamp, TimeUnit unit);
 
   /**
    * Set the epoch {@code timestamp}, using the instant.
    *
-   * <p>The {@code timestamp} is the time at which the log record occurred. If unset, it will be set
-   * to the current time when {@link #emit()} is called.
+   * <p>Note: If not set, the emitted log will not have a timestamp.
    */
   LogRecordBuilder setTimestamp(Instant instant);