Add guides on Getting Started with JS (#4150)

- Get started section added to the JS docs
- Small fixes in the JS modules docs

documentation/js/js_gui__text_input.md

@@ -1,6 +1,5 @@
-# js_gui__text_input {#js_gui__text_input}
+# Text input GUI view {#js_gui__text_input}
 
-# Text input GUI view
 Displays a keyboard.
 
 <img src="text_input.png" width="200" alt="Sample screenshot of the view" />
@@ -16,29 +15,29 @@ This module depends on the `gui` module, which in turn depends on the
 recommended to conceptualize these modules first before using this one.
 
 # Example
-For an example refer to the `gui.js` example script.
+For an example, refer to the `gui.js` example script.
 
 # View props
 ## `minLength`
-Smallest allowed text length
+The shortest allowed text length.
 
 Type: `number`
 
 ## `maxLength`
-Biggest allowed text length
+The longest allowed text length.
 
 Type: `number`
 
 Default: `32`
 
 ## `header`
-Single line of text that appears above the keyboard
+A single line of text that appears above the keyboard.
 
 Type: `string`
 
 # View events
 ## `input`
-Fires when the user selects the "save" button and the text matches the length
+Fires when the user selects the "Save" button and the text matches the length
 constrained by `minLength` and `maxLength`.
 
 Item type: `string`