Update docs/toolhive/guides-cli/run-mcp-servers.mdx

Co-authored-by: Dan Barr <[email protected]>

Author: rdimitrov

docs/toolhive/guides-cli/run-mcp-servers.mdx

@@ -38,7 +38,8 @@ For example, to run all servers in a group called `dev-toolkit`:
 thv group run dev-toolkit
 ```
 
-This starts all servers defined within the specified registry group. See
+Running a group starts all servers defined within that group simultaneously,
+saving you from running each server individually. See
 [Registry groups](./registry.md#organize-servers-with-registry-groups) for more
 information about organizing servers into groups in your custom registry.