Clean up some typos

Remove redundant args from some js funcs, and fix a comment typo

include/olm/outbound_group_session.h

@@ -160,7 +160,7 @@ size_t olm_outbound_group_session_key_length(
 /**
  * Get the base64-encoded current ratchet key for this session.
  *
- * Each message is sent with a diffent ratchet key. This function returns the
+ * Each message is sent with a different ratchet key. This function returns the
  * ratchet key that will be used for the next message.
  *
  * Returns the length of the ratchet key on success or olm_error() on

javascript/olm_outbound_group_session.js

@@ -53,7 +53,7 @@ OutboundGroupSession.prototype['unpickle'] = restore_stack(function(key, pickle)
     );
 });
 
-OutboundGroupSession.prototype['create'] = restore_stack(function(key) {
+OutboundGroupSession.prototype['create'] = restore_stack(function() {
     var random_length = outbound_group_session_method(
         Module['_olm_init_outbound_group_session_random_length']
     )(this.ptr);
@@ -78,7 +78,7 @@ OutboundGroupSession.prototype['encrypt'] = restore_stack(function(plaintext) {
     return Pointer_stringify(message_buffer);
 });
 
-OutboundGroupSession.prototype['session_id'] = restore_stack(function(key) {
+OutboundGroupSession.prototype['session_id'] = restore_stack(function() {
     var length = outbound_group_session_method(
         Module['_olm_outbound_group_session_id_length']
     )(this.ptr);
@@ -89,7 +89,7 @@ OutboundGroupSession.prototype['session_id'] = restore_stack(function(key) {
     return Pointer_stringify(session_id);
 });
 
-OutboundGroupSession.prototype['session_key'] = restore_stack(function(key) {
+OutboundGroupSession.prototype['session_key'] = restore_stack(function() {
     var key_length = outbound_group_session_method(
         Module['_olm_outbound_group_session_key_length']
     )(this.ptr);