Fix minor punctuation in README && Fix minor typo in documentation (#42832)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: khujrat17

README.md

@@ -1,6 +1,7 @@
 # GitHub Docs <!-- omit in toc -->
 
-Welcome to GitHub Docs! GitHub’s documentation is open source, meaning anyone from inside or outside the company can contribute. For full contributing guidelines, visit our [contributing guide](https://docs.github.com/en/contributing)
+Welcome to GitHub Docs! GitHub’s documentation is open source, meaning anyone from inside or outside the company can contribute. For full contributing guidelines, visit our [contributing guide](https://docs.github.com/en/contributing).
+
 
 ## Quick links by contributor type