Fix 22 typos found by codespell

Here are typos with their counts and introduced fix:

      1 autmatically ==> automatically
      1 commited ==> committed
      1 currenlty ==> currently
      1 dependecies ==> dependencies
      1 referrenced ==> referenced
      1 signleton ==> singleton
      1 somwhere ==> somewhere
      1 specied ==> specified
      1 specifiy ==> specify
      1 statment ==> statement
      1 successfuly ==> successfully
      1 unavaiable ==> unavailable
      2 ellapsed ==> elapsed
      3 arrray ==> array
      3 compatability ==> compatibility
      3 defintion ==> definition
      4 compability ==> compatibility
      4 mesage ==> message
      4 notifiction ==> notification
      5 re-use ==> reuse
      6 doesnt ==> does not
      6 non-existant ==> non-existent

test/unit/@node-red/runtime/lib/nodes/credentials_spec.js

@@ -158,7 +158,7 @@ describe('red/runtime/nodes/credentials', function() {
             settings: encryptionDisabledSettings,
             nodes: { getType: () => function(){} }
         });
-        var defintion = {
+        var definition = {
             user1:{type:"text"},
             password1:{type:"password"},
             user2:{type:"text"},
@@ -167,9 +167,9 @@ describe('red/runtime/nodes/credentials', function() {
             password3:{type:"password"}
 
         };
-        credentials.register("test",defintion);
+        credentials.register("test",definition);
         var def = credentials.getDefinition("test");
-        defintion.should.eql(def);
+        definition.should.eql(def);
 
         credentials.load({"node":{user1:"abc",password1:"123",user2:"def",password2:"456",user3:"ghi",password3:"789"}}).then(function() {
             var node = {id:"node",type:"test",credentials:{