Fix most Javadoc errors, except syntax

java/libraries/dxf/src/processing/dxf/RawDXF.java

@@ -31,13 +31,13 @@ import processing.core.*;
  * A simple library to write DXF files with Processing.
  * Because this is used with beginRaw() and endRaw(), only individual
  * triangles and (discontinuous) line segments will be written to the file.
- * <P/>
+ * <p>
  * Use something like a keyPressed() in PApplet to trigger it,
  * to avoid writing a bazillion .dxf files.
- * <P/>
+ * <p>
  * Usually, the file will be saved to the sketch's folder.
  * Use Sketch &rarr; Show Sketch Folder to see it from the PDE.
- * <p/>
+ * <p>
  * A simple example of how to use:
  * <PRE>
  * import processing.dxf.*;
@@ -104,7 +104,7 @@ import processing.core.*;
  * </PRE>
  * Note that even though this class is a subclass of PGraphics, it only
  * implements the parts of the API that are necessary for beginRaw/endRaw.
- * <P/>
+ * <p>
  * Based on the original DXF writer from Simon Greenwold, February 2004.
  * Updated for Processing 0070 by Ben Fry in September 2004,
  * and again for Processing beta in April 2005.

java/libraries/io/src/processing/io/SPI.java

@@ -145,7 +145,7 @@ public class SPI {
    *  Configures the SPI interface
    *  @param maxSpeed maximum transmission rate in Hz, 500000 (500 kHz) is a resonable default
    *  @param dataOrder whether data is send with the first- or least-significant bit first (SPI.MSBFIRST or SPI.LSBFIRST, the former is more common)
-   *  @param mode <a href="https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Clock_polarity_and_phase">SPI.MODE0 to SPI.MODE3</br>
+   *  @param mode <a href="https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Clock_polarity_and_phase">SPI.MODE0 to SPI.MODE3</a>
    *  @webref
    */
   public void settings(int maxSpeed, int dataOrder, int mode) {

java/libraries/serial/src/processing/serial/Serial.java

@@ -533,7 +533,7 @@ public class Serial implements SerialPortEventListener {
    * @generate serialEvent.xml
    * @webref serial:events
    * @usage web_application
-   * @param serialPorttEvent the port where new data is available
+   * @param event the port where new data is available
    */
   public void serialEvent(SerialPortEvent event) {
     if (event.getEventType() == SerialPortEvent.RXCHAR) {