[docs] Add missing JavaDocs (#6125)

wpiutil/src/main/java/edu/wpi/first/util/CircularBuffer.java

@@ -4,7 +4,11 @@
 
 package edu.wpi.first.util;
 
-/** This is a simple circular buffer so we don't need to "bucket brigade" copy old values. */
+/**
+ * This is a simple circular buffer so we don't need to "bucket brigade" copy old values.
+ *
+ * @param <T> Buffer element type.
+ */
 public class CircularBuffer<T> {
   private T[] m_data;
 
@@ -17,7 +21,7 @@ public class CircularBuffer<T> {
   /**
    * Create a CircularBuffer with the provided size.
    *
-   * @param size The size of the circular buffer.
+   * @param size Maximum number of buffer elements.
    */
   @SuppressWarnings("unchecked")
   public CircularBuffer(int size) {