Reword some docs in the getting started guide (#13888)

Author: 27medkamal

lib/elixir/pages/getting-started/processes.md

@@ -53,7 +53,7 @@ iex> receive do
 "world"
 ```
 
-When a message is sent to a process, the message is stored in the process mailbox. The `receive/1` block goes through the current process mailbox searching for a message that matches any of the given patterns. `receive/1` supports guards and many clauses, such as `case/2`.
+When a message is sent to a process, the message is stored in the process mailbox. The `receive/1` block goes through the current process mailbox searching for a message that matches any of the given patterns. `receive/1` supports guards and many clauses, exactly as `case/2`.
 
 The process that sends the message does not block on `send/2`, it puts the message in the recipient's mailbox and continues. In particular, a process can send messages to itself.