fix(curriculum): make markdown to html converter more clear in events and syntax (freeCodeCamp#64094)

Author: majestic-owl448

curriculum/challenges/english/blocks/lab-markdown-to-html-converter/66f55eac933ff64ce654ca74.md

@@ -18,15 +18,17 @@ Markdown is a markup language used to add formatting elements to plain-text docu
 
 1. You should have a function named `convertMarkdown` that takes no parameters.
 1. The `convertMarkdown` function should use regular expressions to convert the markdown input from `#markdown-input` into HTML and should return a string containing the HTML code.
-1. The `convertMarkdown` function should convert headings of level one, two, and three into the corresponding `h1`, `h2`, and `h3` elements. A heading in markdown is indicated by as many `#` character as its level followed by a space and the heading text. `#` characters should either be placed at the beginning of the line or be preceded by space characters.
+1. The `convertMarkdown` function should convert headings of level one, two, and three into the corresponding `h1`, `h2`, and `h3` elements. A heading in markdown is indicated by as many `#` character as its level followed by a space and the heading text. `#` characters should be placed at the beginning of the line: there can be spaces but no other characters before it.
 1. The `convertMarkdown` function should convert bold text into `strong` elements. Bold text in markdown is indicated either by a pair of double asterisks or a pair of double underscores enclosing the text.
 1. The `convertMarkdown` function should convert italic text into `em` elements. Italic text in markdown is indicated either by a pair of asterisks or a pair of underscores enclosing the text.
 1. The `convertMarkdown` function should convert images into `img` elements. An image in markdown is indicated by `![alt-text](image-source)`, where `alt-text` is the value of the `alt` attribute and `image-source` is the value of the `src` attribute.
 1. The `convertMarkdown` function should convert links into anchor elements. A link in markdown is indicated by `[link text](URL)`, where `link text` is the text to enclosed within the anchor tags and `URL` is the value of `href` attribute.
-1. The `convertMarkdown` function should convert quotes into `blockquote` elements. A quote in markdown is indicated by a `>` followed by a space and the quote text. The `>` character should be either placed at the beginning of the line or be preceded by space characters.
+1. The `convertMarkdown` function should convert quotes into `blockquote` elements. A quote in markdown is indicated by a `>` followed by a space and the quote text. The `>` character should be placed at the beginning of the line: there can be spaces but no other characters before it.
 1. When you input text inside `#markdown-input`, the raw HTML code returned by `convertMarkdown` should be displayed inside `#html-output`.
 1. When you input text inside `#markdown-input`, the HTML code returned by `convertMarkdown` should be rendered inside `#preview`.
 
+Note: you should work with the `input` event for this project.
+
 Here's a table containing all the markdown that `convertMarkdown` should be able to handle and the expected HTML after conversion:
 
 <table>