spell ephemeral correctly...

include/olm/ratchet.hh

@@ -94,7 +94,7 @@ struct Ratchet {
 
     /** The sender chain is used to send messages. Each time a new ephemeral
      * key is received from the remote server we generate a new sender chain
-     * with a new empheral key when we next send a message. */
+     * with a new ephemeral key when we next send a message. */
     List<SenderChain, 1> sender_chain;
 
     /** The receiver chain is used to decrypt received messages. We store the

src/ratchet.cpp

@@ -595,7 +595,7 @@ std::size_t olm::Ratchet::decrypt(
     if (!chain) {
         /* They have started using a new ephemeral ratchet key.
          * We need to derive a new set of chain keys.
-         * We can discard our previous empheral ratchet key.
+         * We can discard our previous ephemeral ratchet key.
          * We will generate a new key when we send the next message. */
 
         chain = receiver_chains.insert();