docs: generic interfaces support for ireturn linter

Updated yaml config to show supported feature of `ireturn` linter

.golangci.reference.yml

@@ -1159,13 +1159,14 @@ linters-settings:
  max: 5
 
  ireturn:
- # ireturn allows using `allow` and `reject` settings at the same time.
+ # ireturn does not allow using `allow` and `reject` settings at the same time.
  # Both settings are lists of the keywords and regular expressions matched to interface or package names.
  # keywords:
  # - `empty` for `interface{}`
  # - `error` for errors
  # - `stdlib` for standard library
  # - `anon` for anonymous interfaces
+ # - `generic` for generic interfaces added in go 1.18
 
  # By default, it allows using errors, empty interfaces, anonymous interfaces,
  # and interfaces provided by the standard library.