Link to OAuth article since it's not a vignette

Fixes #398

R/oauth-flow-auth-code.R

@@ -11,7 +11,8 @@
 #' running on a hosted platform like RStudio Server), provide a custom
 #' `redirect_uri` and httr2 will prompt the user to enter the code manually.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>.
 #'
 #' # Security considerations
 #'
@@ -77,7 +78,7 @@
 #' the number of times that you need to re-authenticate at the cost of
 #' storing access credentials on disk.
 #'
-#' Learn more in `vignette("oauth")`
+#' Learn more in <https://httr2.r-lib.org/articles/oauth.html>.
 #' @param cache_key If you want to cache multiple tokens per app, use this
 #' key to disambiguate them.
 #' @returns `req_oauth_auth_code()` returns a modified HTTP [request] that will

R/oauth-flow-client-credentials.R

@@ -5,7 +5,8 @@
 #' `r rfc(6749, 4.4)`. It is used to allow the client to access resources that
 #' it controls directly, not on behalf of an user.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>.
 #'
 #' @export
 #' @family OAuth flows

R/oauth-flow-device.R

@@ -6,7 +6,8 @@
 #' ever authenticated an app on your TV, this is probably the flow you've used),
 #' but it also works well from within R.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>.
 #'
 #' @export
 #' @inheritParams oauth_flow_password

R/oauth-flow-jwt.R

@@ -6,7 +6,8 @@
 #' It is often used for service accounts, accounts that are used primarily in
 #' automated environments.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>.
 #'
 #' @export
 #' @family OAuth flows

R/oauth-flow-password.R

@@ -5,7 +5,8 @@
 #' defined by `r rfc(6749, 4.3)`. It allows the user to supply their password
 #' once, exchanging it for an access token that can be cached locally.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>
 #'
 #' @export
 #' @family OAuth flows

R/oauth-flow-refresh.R

@@ -15,7 +15,8 @@
 #' this happening a lot, it's a sign that you should be using a different flow
 #' in your automated tests.
 #'
-#' Learn more about the overall OAuth authentication flow in `vignette("oauth")`.
+#' Learn more about the overall OAuth authentication flow in
+#' <https://httr2.r-lib.org/articles/oauth.html>.
 #'
 #' @inheritParams req_oauth_auth_code
 #' @param refresh_token A refresh token. This is equivalent to a password