fix: grammatical mistakes (skills#51)

Author: DalpatRathore

README.md

@@ -54,9 +54,9 @@ GitHub is about more than code. It’s a platform for software collaboration, an
 
 _Welcome to "Communicate using Markdown"! :wave:_
 
-**What is _Markdown_?** Markdown is a [lightweight syntax](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) for communicating on GitHub. You can format text to add heading, lists, **bold**, _italics_, tables, and many other stylings. You can use Markdown most places around GitHub:
+**What is _Markdown_?** Markdown is a [lightweight syntax](https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax) for communicating on GitHub. You can format text to add a heading, lists, **bold**, _italics_, tables, and many other stylings. You can use Markdown in most places around GitHub:
 
-- Comments in [issues](https://docs.github.com/issues/tracking-your-work-with-issues/about-issues), [pull requests](https://docs.github.com/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests), and [discussions](https://docs.github.com/discussions/collaborating-with-your-community-using-discussions/about-discussions)
+- Comments on [issues](https://docs.github.com/issues/tracking-your-work-with-issues/about-issues), [pull requests](https://docs.github.com/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests), and [discussions](https://docs.github.com/discussions/collaborating-with-your-community-using-discussions/about-discussions)
 - Files with the `.md` or `.markdown` extension
 - Sharing snippets of text in [Gists](https://docs.github.com/github/writing-on-github/editing-and-sharing-content-with-gists/creating-gists)