docs: fix typos and clarify statement (#29626)

For clarity, change the sentence: 
"*D3** does not introduce a new visual representation."
to read as above. 
Change the closing sentence from:
" So, with just some basic knowledge of latest HTML5 features such as SVG, Canvas you can dive into a world where library like **D3.js** bring data to life!" to what is written above. 
Fix typo: Italic item had extra '*' in markdown syntax, this was removed:  *D3** changed to *D3*.

guide/english/d3/index.md

@@ -13,10 +13,10 @@ title: D3
 
 ## Why D3.js?
 
-*D3** does not introduce a new visual representation. Unlike **Processing**, **Raphaël**, or **Protovis**, *D3's* vocabulary of graphical marks comes directly from web standards: HTML, SVG, and CSS - https://d3js.org/
+For those already familiar with HTML and CSS, *D3* is quick to learn. Unlike **Processing**, **Raphaël**, or **Protovis**, *D3's* vocabulary of graphical marks comes directly from web standards: HTML, SVG, and CSS - https://d3js.org/
 
 ## Get Started
-There are over [20,000+ **D3.js** examples](https://github.com/d3/d3/wiki/Gallery) you could learn from, but you never know how approachable any given one will be! So, the question is - how do you build up your visualization from first principles? As you've probably seen, D3's API is massive, so lets call out a few of the utilities that will be particularly helpful early on:
+There are over [20,000 **D3.js** examples](https://github.com/d3/d3/wiki/Gallery) you could learn from, but you never know how approachable any given one will be! So, the question is - how do you build up your visualization from first principles? As you've probably seen, D3's API is massive, so lets call out a few of the utilities that will be particularly helpful early on:
 
 - **[d3-scale](https://github.com/d3/d3-scale)**
 
@@ -46,13 +46,12 @@ There are over [20,000+ **D3.js** examples](https://github.com/d3/d3/wiki/Galler
 
 ![](https://i1.wp.com/pbiswas101.files.wordpress.com/2018/07/force.gif?w=400&h=100)
 
- With just some basic knowledge of the latest HTML5 features such as SVG and Canvas, you can dive into a world where a library like **D3.js** can bring data to life!
+With just some basic knowledge of the latest HTML5 features such as SVG and Canvas, you can dive into a world where a library like **D3.js** can bring data to life!
 
 ### Contribution
-
 -  https://github.com/d3/
 
- ### Resources
+### Resources
 - [Wikipedia](https://en.wikipedia.org/wiki/D3.js)
 - [Blockbuilder](http://blockbuilder.org/search)
 - [D3 in Depth](https://d3indepth.com)