docs: Reviewers are only added during PR/MR creation, but not modified afterwards (#36108)

Author: kastl-ars

docs/usage/configuration-options.md

@@ -151,6 +151,8 @@ This option _adds_ to the existing reviewer list, rather than _replacing_ it lik
 Use `additionalReviewers` when you want to add to a preset or base list, without replacing the original.
 For example, when adding focused reviewers for a specific package group.
 
+Please note that Reviewers are only added during creation of a PR, but are not modified afterwards.
+
 ## assignAutomerge
 
 By default, Renovate will not assign reviewers and assignees to an automerge-enabled PR unless it fails status checks.
@@ -2381,6 +2383,8 @@ In the case that a user is automatically added as reviewer (such as Renovate App
 }
 ```
 
+Please note that Reviewers are only added during creation of a PR, but are not modified afterwards.
+
 ## ignoreScripts
 
 By default, Renovate will disable package manager scripts.
@@ -4176,6 +4180,8 @@ For example: if the username or team name is `bar` then you would set the config
 }
 ```
 
+Please note that Reviewers are only added during creation of a PR, but are not modified afterwards.
+
 ## reviewersFromCodeOwners
 
 If enabled Renovate tries to determine PR reviewers by matching rules defined in a CODEOWNERS file against the changes in the PR.
@@ -4186,6 +4192,8 @@ Read the docs for your platform for details on syntax and allowed file locations
 - [GitLab, Code Owners](https://docs.gitlab.com/ee/user/project/codeowners/)
 - [Bitbucket, Set up and use code owners](https://support.atlassian.com/bitbucket-cloud/docs/set-up-and-use-code-owners/)
 
+Please note that Reviewers are only added during creation of a PR, but are not modified afterwards.
+
 <!-- prettier-ignore -->
 !!! note
     GitLab `CODEOWNERS` files with default owners are _not_ supported. See [#29202](https://github.com/renovatebot/renovate/issues/29202).