Update Appveyor badge docs

* indicate you can specify the appveyor project id if you want to use that instead

This PR is part of: https://github.com/rust-lang/crates.io/issues/693

diff --git a/src/doc/manifest.md b/src/doc/manifest.md
index 482d9c764997dd09cfd01aa7349cf193e58e625b..1b31064fbe20ec47a19d2c9ecf86bd226bf58a04 100644 (file)
--- a/src/doc/manifest.md
+++ b/src/doc/manifest.md
@@ -185,7 +185,8 @@ license-file = "..."
 
 # Appveyor: `repository` is required. `branch` is optional; default is `master`
 # `service` is optional; valid values are `github` (default), `bitbucket`, and
-# `gitlab`.
+# `gitlab`; `id` is optional; you can specify the appveyor project id if you 
+# want to use that instead.
 appveyor = { repository = "...", branch = "master", service = "github" }
 
 # Circle CI: `repository` is required. `branch` is optiona; default is `master`