correct typo

Author: beiwei30

dubbo-rpc/dubbo-rpc-memcached/src/main/java/com/alibaba/dubbo/rpc/protocol/memcached/MemcachedProtocol.java

@@ -91,7 +91,7 @@ protected Result doInvoke(Invocation invocation) throws Throwable {
                             throw new UnsupportedOperationException("Unsupported method " + invocation.getMethodName() + " in memcached service.");
                         }
                     } catch (Throwable t) {
-                        RpcException re = new RpcException("Failed to invoke memecached service method. interface: " + type.getName() + ", method: " + invocation.getMethodName() + ", url: " + url + ", cause: " + t.getMessage(), t);
+                        RpcException re = new RpcException("Failed to invoke memcached service method. interface: " + type.getName() + ", method: " + invocation.getMethodName() + ", url: " + url + ", cause: " + t.getMessage(), t);
                         if (t instanceof TimeoutException || t instanceof SocketTimeoutException) {
                             re.setCode(RpcException.TIMEOUT_EXCEPTION);
                         } else if (t instanceof MemcachedException || t instanceof IOException) {
@@ -110,7 +110,7 @@ public void destroy() {
                 }
             };
         } catch (Throwable t) {
-            throw new RpcException("Failed to refer memecached service. interface: " + type.getName() + ", url: " + url + ", cause: " + t.getMessage(), t);
+            throw new RpcException("Failed to refer memcached service. interface: " + type.getName() + ", url: " + url + ", cause: " + t.getMessage(), t);
         }
     }