Edit docs for webglVersion

Author: nickmcintyre

src/core/environment.js

@@ -464,9 +464,12 @@ p5.prototype.noCursor = function() {
 };
 
 /**
- * A string variable with the WebGL version in use. The value equals one of
- * the string constants `WEBGL2`, `WEBGL`, or `P2D`, which is the default for
- * 2D sketches.
+ * A string variable with the WebGL version in use. Its value equals one of
+ * the followin string constants:
+ *
+ * - `WEBGL2` whose value is `'webgl2'`,
+ * - `WEBGL` whose value is `'webgl'`, or
+ * - `P2D` whose value is `'p2d'`. This is the default for 2D sketches.
  *
  * See <a href="#/p5/setAttributes">setAttributes()</a> for ways to set the
  * WebGL version.
@@ -497,6 +500,7 @@ p5.prototype.noCursor = function() {
  * }
  *
  * function setup() {
+ *   // Create a canvas using WEBGL mode.
  *   createCanvas(100, 50, WEBGL);
  *   background(200);
  *
@@ -520,6 +524,7 @@ p5.prototype.noCursor = function() {
  * }
  *
  * function setup() {
+ *   // Create a canvas using WEBGL mode.
  *   createCanvas(100, 50, WEBGL);
  *
  *   // Set WebGL to version 1.
@@ -542,7 +547,7 @@ p5.prototype.webglVersion = C.P2D;
 /**
  * A numeric variable that stores the width of the screen display. Its value
  * depends on the current <a href="#/p5/pixelDensity">pixelDensity()</a>.
- * `displayWidth()` is useful for running full-screen programs.
+ * `displayWidth` is useful for running full-screen programs.
  *
  * Note: The actual screen width can be computed as
  * `displayWidth * pixelDensity()`.