Fix missing p5. prefix in Simple Melody App tutorial

src/content/tutorials/en/getting-started-with-nodejs.mdx

@@ -225,7 +225,7 @@ Object i
 // ...prototype
 ```
 
-Now you are ready to build the [Melody App](https://docs.google.com/document/u/0/d/1mzJv-7qU1_CmkWI0ZFeqf3CeBfpOOVIrvPRZtxqFxRI/edit)! You can access completed code for this guide in [this Github repository](https://github.com/MsQCompSci/melodyAppNodeStarter/tree/main).
+Now you are ready to build the [Melody App](./simple-melody-app)! You can access completed code for this guide in [this Github repository](https://github.com/MsQCompSci/melodyAppNodeStarter/tree/main).
 
 
 ## Next Steps

src/content/tutorials/en/optimizing-webgl-sketches.mdx

@@ -431,7 +431,7 @@ Try making a swarm of bugs, flock of birds, or school of fish by making a `p5.Ge
 
 There are many effects one can achieve that involve looking at and modifying individual pixels on the canvas. Unfortunately, modifying `pixels` in your sketch involves looping through every pixel, one at a time, in JavaScript. A shader, on the other hand, can run in parallel for every pixel at once, making it a great alternative for when speed is required.
 
-Here is an example of some noise-based dithering using `pixels`, and the equivalent filter using a shader. Be sure to check out our [introduction to shaders](https://docs.google.com/document/u/0/d/1R7eO9XHcACHnxanFCKVviBK2c1Pci0y9qfRwuHY2_PI/edit) for more information about shader programming.
+Here is an example of some noise-based dithering using `pixels`, and the equivalent filter using a shader. Be sure to check out our [introduction to shaders](./intro-to-shaders) for more information about shader programming.
 
 <Columns>
 <Column>

src/content/tutorials/en/simple-melody-app.mdx

@@ -54,7 +54,7 @@ If you are already familiar with:
 - [periodic waves and their characteristics](#periodic-wave-characteristics)
 - [musical notes (frequency, pitch, and amplitude)](#musical-notes)
 
-Skip to [Play musical notes with oscillators](https://docs.google.com/document/d/1mzJv-7qU1_CmkWI0ZFeqf3CeBfpOOVIrvPRZtxqFxRI/edit#heading=h.xqocsbtmp68w) to bypass background knowledge.
+Skip to [Play musical notes with oscillators](#play-musical-notes-with-oscillators) to bypass background knowledge.
 
 
 ## Oscillators, science & music background information
@@ -68,18 +68,18 @@ To understand how oscillators generate musical notes, we can dive into some scie
 
 ##### Note
 
-In the next section, [Science of sound and music](https://docs.google.com/document/d/1mzJv-7qU1_CmkWI0ZFeqf3CeBfpOOVIrvPRZtxqFxRI/edit#bookmark=id.xmj3wil8257x), the following concepts are introduced:
+In the next section, [Science of sound and music](#science-of-sound--music), the following concepts are introduced:
 
 - [Sound as a pressure waves](https://www.physicsclassroom.com/class/sound/u11l1c.cfm)
-- [Periodic wave characteristics](https://docs.google.com/document/d/1mzJv-7qU1_CmkWI0ZFeqf3CeBfpOOVIrvPRZtxqFxRI/edit#heading=h.p80snea79dfs)
+- [Periodic wave characteristics](#periodic-wave-characteristics)
 - [Sound waves](https://www.open.edu/openlearn/science-maths-technology/engineering-technology/sound-music-technology-an-introduction/content-section-2.3) in relation to musical notes
   - [Pitch and frequency](https://www.physicsclassroom.com/class/sound/Lesson-2/Pitch-and-Frequency)
 - Music Theory concepts such a [melodies](https://www.masterclass.com/articles/music-101-what-is-melody), [musical notes & frequency](https://www.idrumtune.com/ultimate-guide-to-musical-frequencies/) 
 
 
 ##### Skip ahead 
 
-If you are already familiar with the background concepts above, jump over to the [Building a melody app](https://docs.google.com/document/d/1mzJv-7qU1_CmkWI0ZFeqf3CeBfpOOVIrvPRZtxqFxRI/edit#heading=h.xqocsbtmp68w) section to begin your project! 
+If you are already familiar with the background concepts above, jump over to the [Building a melody app](#build-simple-app) section to begin your project! 
 
 
 ## Science of sound & music 
@@ -165,7 +165,7 @@ The **frequency** of sound waves can be heard through its tones, or pitch, which
 Visit the [Sound Synthesis Tutorial from The Coding Train](https://www.youtube.com/watch?app=desktop\&v=Bk8rLzzSink) for a brief introduction to p5.Oscillator objects and waves.
 
 
-## Play musical notes with osciallators
+## Play musical notes with oscillators
 
 Let’s dive into the wonderful world of sound, music and oscillators to create a [simple melody app](https://editor.p5js.org/Msqcoding/sketches/w_4t5bFYe)! 
 
@@ -295,7 +295,7 @@ let myFreq = 262;
 function setup() {
   createCanvas(400, 400);
   // Create the Oscillator object.
-  osc = new Oscillator(myFreq);
+  osc = new p5.Oscillator(myFreq);
   // console.log(osc.f);
 }