Update PGraphics.java: fix typos in documentation

Author: Konsl

core/src/processing/core/PGraphics.java

@@ -2496,7 +2496,7 @@ protected void curveVertexSegment(float x1, float y1, float z1,
    * <br />
    * Using point() with strokeWeight(1) or smaller may draw nothing to the screen,
    * depending on the graphics settings of the computer. Workarounds include
-   * setting the pixel using <b>set()</s> or drawing the point using either
+   * setting the pixel using <b>set()</b> or drawing the point using either
    * <b>circle()</b> or <b>square()</b>.
    *
    * @webref shape:2d primitives
@@ -6439,7 +6439,7 @@ public PStyle getStyle(PStyle s) {  // ignore
    * <br />
    * Using point() with strokeWeight(1) or smaller may draw nothing to the screen,
    * depending on the graphics settings of the computer. Workarounds include
-   * setting the pixel using <b>set()</s> or drawing the point using either
+   * setting the pixel using <b>set()</b> or drawing the point using either
    * <b>circle()</b> or <b>square()</b>.
    *
    * @webref shape:attributes