Clarify reader/writer role descriptions in docs (#4)

Update capabilities table in rbac.mdx and teams.mdx to specify that
roles affect context index permissions, not plan access. Add note
clarifying all team members can read and write plans regardless of role.

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Matt Dailey <matt@ref.tools>

Author: devin-ai-integration[bot]

usage/rbac.mdx

@@ -9,14 +9,16 @@ Ref allows you to give different members of your team different capabilities, so
 
 | Role | Capabilities |
 | --- | --- |
-| Admin | Search resources, add content, invite members, manage billing |
-| Writer | Search resources and add to the index |
-| Reader | Search only |
+| Admin | Search context index, add content to index, invite members, manage billing |
+| Writer | Search context index and add content to index |
+| Reader | Search context index |
+
+> All team members can read and write plans regardless of role. Reader and Writer roles only affect permissions for the shared context index (indexed repositories).
 
 ## Management
 
 Roles can be managed from [ref.tools/team](https://ref.tools/team). Make sure that your team is selected in the workspace picker in the top-left of the page.
 
 ## How to only use public docs
 
-Some teams use Ref to only search public documentation sources. The best way to manage this is have one user sign up as an `admin` and invite the rest of the users as `readers`. Then no one will be able to index private sources. 
+Some teams use Ref to only search public documentation sources. The best way to manage this is have one user sign up as an `admin` and invite the rest of the users as `readers`. Then no one will be able to index private sources.  

usage/teams.mdx

@@ -23,9 +23,11 @@ Manage the capabilities of different team members with role-based access control
 
 | Role | Capabilities |
 | --- | --- |
-| Admin | Search resources, add content, invite members, manage billing |
-| Writer | Search resources and add to the index |
-| Reader | Search only |
+| Admin | Search context index, add content to index, invite members, manage billing |
+| Writer | Search context index and add content to index |
+| Reader | Search context index |
+
+> All team members can read and write plans regardless of role. Reader and Writer roles only affect permissions for the shared context index (indexed repositories).
 
 ### 5. Unified billing
 Manage your team's bill from a single account.