chore: fix common typos in docs and comments (#5352)

## Changes

### Code Comments
- js/js-export/ASTutils.js (L333): defintion  definition
- js/widgets/pitchslider.js (L41): Intializes  Initializes

### Documentation
- js/widgets/README.md: Intialize/initalize  Initialize/initialize
- Docs/guide-es/README.md: substitued/occurance  substituted/occurrence
- Docs/guide-ja/README.md: substitued/occurance  substituted/occurrence
- Docs/guide-zhCN/README.md: substitued/occurance  substituted/occurrence
- usermanual/.../widgets.html: substitued/occurance  substituted/occurrence

No functional changes; only spelling corrections in comments and documentation.

Author: Inuth0603

Docs/guide-es/README.md

@@ -718,8 +718,8 @@ can be used inside the _Pitch-time Matrix_ block.
 
 The _Set Drum_ block is used to map the enclosed pitches into drum
 sounds. Drum sounds are played in a monopitch using the specified drum
-sample. In the example above, a `kick drum` will be substitued for
-each occurance of a `Re` `4`.
+sample. In the example above, a `kick drum` will be substituted for
+each occurrence of a `Re` `4`.
 
 ![alt tag](./drum8.svg " ")
 

Docs/guide-ja/README.md

@@ -818,8 +818,8 @@ can be used inside the *ピッチ・タイム行列* block.
 
 The *Set ドラム* block is used to map the enclosed pitches into ドラム
 sounds. ドラム sounds are played in a monopitch using the specified ドラム
-sample. In the example above, a `kick ドラム` will be substitued for
-each occurance of a `レ` `4`.
+sample. In the example above, a `kick ドラム` will be substituted for
+each occurrence of a `レ` `4`.
 
 ![alt tag](./drum8.svg "ピッチ・ドラム・グラフ 1")
 

Docs/guide-zhCN/README.md

@@ -755,8 +755,8 @@ notes.
 
 The *Set Drum* block is used to map the enclosed pitches into drum
 sounds. Drum sounds are played in a monopitch using the specified drum
-sample. In the example above, a `kick drum` will be substitued for
-each occurance of a `Re` `4`.
+sample. In the example above, a `kick drum` will be substituted for
+each occurrence of a `Re` `4`.
 
 *Set Drum* 块用于将封闭的音高映射到鼓中声音。
 鼓声使用指定的鼓在单声道中播放。

js/js-export/ASTutils.js

@@ -330,7 +330,7 @@ class ASTUtils {
     }
 
     /**
-     * Returns the Abstract Syntax Tree for the bare minimum method defintion code
+     * Returns the Abstract Syntax Tree for the bare minimum method definition code
      *
      * @static
      * @param {String} methodName - method name

js/widgets/README.md

@@ -21,9 +21,9 @@ imported in `js/activity.js`.
    ```
    This class will contain the code that defines the behavior of your widget.
 
-3. **Intialize the Class**
+3. **Initialize the Class**
    Define the block that will be used to launch your widget in `js/blocks/WidgetBlocks.`
-   Don't forget to initalize the class. (Look at the code towards the end of the file.)
+   Don't forget to initialize the class. (Look at the code towards the end of the file.)
 
    ```javascript
    new UniqueClass().setup(activity);

js/widgets/pitchslider.js

@@ -38,7 +38,7 @@ class PitchSlider {
     }
 
     /**
-     * Intializes the pitch/slider
+     * Initializes the pitch/slider
      * @returns {void}
      */
     init(activity) {