docs(README): add link to GitHub App OAuth web flow

Author: gr2m

README.md

@@ -5,7 +5,7 @@
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-See [GitHub’s Developer Guide for the OAuth App web application flow](https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps/#web-application-flow). Note that the [OAuth web application flow for GitHub Apps] is slightly different. GitHub Apps do not support scopes for its user access tokens (they are called user-to-server tokens for GitHub Apps), instead they inherit the user permissions from the GitHub App's registration and the repository/organization access and permissions from the respective installation.
+See [GitHub’s Developer Guide for the OAuth App web application flow](https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps/#web-application-flow). Note that the [OAuth web application flow for GitHub Apps](https://docs.github.com/en/developers/apps/identifying-and-authorizing-users-for-github-apps#web-application-flow) is slightly different. GitHub Apps do not support scopes for its user access tokens (they are called user-to-server tokens for GitHub Apps), instead they inherit the user permissions from the GitHub App's registration and the repository/organization access and permissions from the respective installation.
 
 ## Usage