(DOCSP-23944) Adds Atlas CLI custom role to rstspec.toml (#419)

* (DOCSP-23944) Adds Atlas CLI custom role to rstspec.toml

* Removes brackets

Author: sarahsimpers

snooty/rstspec.toml

@@ -1600,6 +1600,10 @@ type = {link = "https://www.mongodb.com/docs/atlas/reference/api-resources-spec/
 [role."oas-atlas-op"]
 type = {link = "https://www.mongodb.com/docs/atlas/reference/api-resources-spec/#operation%s"}
 
+[role."atlascli"]
+help = """Link to a page in the Atlas CLI documentation."""
+type = {link = "https://www.mongodb.com/docs/atlas/cli/stable%s", ensure_trailing_slash = true}
+
 ### Types of objects (directive & role pairs)
 [rstobject."py:class"]