docs: update link to secondary rate limit in README

The link was pointing to general API docs, whereas now it points to the section about secondary rate limits.

Additional minor improvements in README.md

README.md

@@ -2,10 +2,10 @@
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/gofri/go-github-ratelimit)](https://goreportcard.com/report/github.com/gofri/go-github-ratelimit)
 
-Package go-github-ratelimit provides a http.RoundTripper implementation that handles [secondary rate limit](https://docs.github.com/en/rest/overview/resources-in-the-rest-api?apiVersion=2022-11-28#secondary-rate-limits) for the GitHub API.  
+Package `go-github-ratelimit` provides an http.RoundTripper implementation that handles [secondary rate limit](https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api?apiVersion=2022-11-28#about-secondary-rate-limits) for the GitHub API.  
 The RoundTripper waits for the secondary rate limit to finish in a blocking mode and then issues/retries requests.
 
-go-github-ratelimit can be used with any HTTP client communicating with GitHub API.    
+`go-github-ratelimit` can be used with any HTTP client communicating with GitHub API.    
 It is meant to complement [go-github](https://github.com/google/go-github), but there is no association between this repository and the go-github repository or Google.  
 
 ## Installation