Update a link in the credits (#382)

This updates the link to docusaurus-openapi, so that it points to the project indicated by the link text.

Author: JoarLeth

README.md

@@ -293,7 +293,7 @@ yarn watch:demo
 
 ## Credits
 
-Special thanks to @bourdakos1 (Nick Bourdakos), the author of [docusaurus-openapi](https://github.com/cloud-annotations/cloud-annotations), which this project is heavily based on.
+Special thanks to @bourdakos1 (Nick Bourdakos), the author of [docusaurus-openapi](https://github.com/cloud-annotations/docusaurus-openapi), which this project is heavily based on.
 
 For more insight into why we decided to completely fork see [#47](https://github.com/PaloAltoNetworks/docusaurus-openapi-docs/pull/47)