Improvements of "Getting started" docs

[vfdev-5]

🚀 Feature

Currently, we propose to our users the following documents to getting started:

• https://pytorch.org/ignite/quickstart.html
• https://pytorch.org/ignite/concepts.html

The idea is to review and improve these documents by

1. fixing typos,
2. adding missing links
3. rewording sentences to simplify the understanding,

Any other constructive suggestions on how to simplify the learning curve for the tool are very welcome !

For PyDataGlobal contributors, feel free to ask questions for details if any and say that you would like to tackle the issue.
Please, take a look at CONTRIBUTING guide.

[afzal442]

PyData Global I am looking forward to contributing here. It's my first time though.

[vfdev-5]

@Afzal-Ind sure ! Please, read this issue description and follow the guidelines. Feel free to ask questions for other details here or reach out to me on mattermost if needed: "vfdev-5"
For global info, please see #1437

Let me assign it to you. Please, note that we can assigne several persons.

[afzal442]

@vfdev-5 Thank you, Sir. I went through the guidelines. I want to connect with you. Would you tell me your username on Mattermost?

[vfdev-5]

Would you tell me your username on Mattermost?

Sure, please use "vfdev-5".