docs(team_membership): clarify org owner note (#2435)

When reviewing the documentation the note on Org owners was confusing. This change updates the wording for better clarity.

Co-authored-by: Keegan Campbell <me@kfcampbell.com>

website/docs/r/team_membership.html.markdown

@@ -16,7 +16,7 @@ destroyed, the user will be removed from the team.
 
 ~> **Note** This resource is not compatible with `github_team_members`. Use either `github_team_members` or `github_team_membership`.
 
-~> **Note** Organization owners may not be set as "members" of a team; they may only be set as "maintainers". Attempting to set organization an owner to "member" of a may result in a `terraform plan` diff that changes their status back to "maintainer".
+~> **Note** Organization owners may not be set as "members" of a team; they may only be set as "maintainers". Attempting to set an organization owner as a "member" of a team may result in a `terraform plan` diff that changes their status back to "maintainer".
 
 ## Example Usage