Update inline documentation to use describe() instead of @alt | resolves #5139

contributor_docs/inline_documentation.md

@@ -189,6 +189,7 @@ noFill();
 arc(50, 55, 60, 60, HALF_PI, PI);
 arc(50, 55, 70, 70, PI, PI+QUARTER_PI);
 arc(50, 55, 80, 80, PI+QUARTER_PI, TWO_PI);
+describe('shattered outline of ellipse created using four arcs');
 </code>
 </div>
 ```
@@ -200,19 +201,28 @@ by a line break.
 ```
 @example
 <div>
-<code>arc(50, 50, 80, 80, 0, PI+QUARTER_PI, OPEN);</code>
+<code>
+arc(50, 50, 80, 80, 0, PI+QUARTER_PI, OPEN);
+describe('ellipse created using arc with its top right open');
+</code>
 </div>
 
 <div>
-<code>arc(50, 50, 80, 80, 0, PI, OPEN);</code>
+<code>
+arc(50, 50, 80, 80, 0, PI, OPEN);
+describe('bottom half of an ellipse created using arc');
+</code>
 </div>
 ```
 
 If you do not want the example to execute your code (i.e. you just want the code to show up), include the class "norender" in the div:
 ```
 @example
 <div class="norender">
-<code>arc(50, 50, 80, 80, 0, PI+QUARTER_PI, OPEN);</code>
+<code>
+arc(50, 50, 80, 80, 0, PI+QUARTER_PI, OPEN);
+describe('ellipse created using arc with its top right open');
+</code>
 </div>
 ```
 
@@ -230,8 +240,42 @@ function setup() {
 
 If you need to link to external asset files, put them in [/docs/yuidoc-p5-theme/assets](https://github.com/processing/p5.js/tree/main/docs/yuidoc-p5-theme/assets) and then link to them with "assets/filename.ext" in the code. See the [tint example](http://p5js.org/reference/#/p5/tint).
 
-### Adding alt-text
-Finally, for every example you add, please add [alt-text](https://moz.com/learn/seo/alt-text) so visually impaired users can understand what the example is showing on the screen. This can be added with the tag `@alt` at the end of all of the examples for a given function (not an individual `@alt` tag under each), add a line break to separate the descriptions for multiple examples.
+### Add a canvas description using describe()
+Finally, for every example you add, you are required to use the p5.js function `describe()` in the example to create a screen-reader accessible description for the canvas. Include only one parameter: a string with a brief description of what is happening on the canvas. Do NOT add a second parameter.
+```
+@example
+<div>
+<code>
+let xoff = 0.0;
+function draw() {
+  background(204);
+  xoff = xoff + 0.01;
+  let n = noise(xoff) * width;
+  line(n, 0, n, height);
+  decribe('vertical line moves left to right with updating noise values');
+}
+</code>
+</div>
+
+<div>
+<code>
+let noiseScale=0.02;
+function draw() {
+  background(0);
+  for (let x=0; x < width; x++) {
+    let noiseVal = noise((mouseX+x)*noiseScale, mouseY*noiseScale);
+    stroke(noiseVal*255);
+    line(x, mouseY+noiseVal*80, x, height);
+  }
+  describe('horizontal wave pattern effected by mouse x-position & updating noise values');
+}
+</code>
+</div>
+
+```
+For more on `describe()` visit the [web accessibility contributor docs](https://p5js.org/contributor-docs/#/web_accessibility?id=user-generated-accessible-canvas-descriptions).
+
+Previous documentation guidelines required adding [alt-text](https://moz.com/learn/seo/alt-text) to create screen-reader accessible canvas description. THIS IS NO LONGER RECOMMENDED. ALWAYS USE `describe()`. Previously, alt-text was added with the tag `@alt` at the end of all of the examples for a given function (not an individual `@alt` tag under each), and an added a line break to separate the descriptions for multiple examples. 
 ```
 @example
 <div>