Fix typo caught by CI

Author: phil-opp

content/this-month/2020-09.md

@@ -97,7 +97,7 @@ defining feature (easy message passing between tasks) is now working!
   All hardware devices on the platform will be added to the Platform Bus by *Bus Drivers*, and described using *properties* (as an
   example, a PCI device will have properties such as `pci.vendor_id`, and `pci.class`). *Device drivers* will be
   able to apply to manage devices by sending a *Filter* to the Platform Bus, which specifies which devices they are
-  able to handle, based on a device's properties. In the future, Platform Bus will be reponsible for handling all
+  able to handle, based on a device's properties. In the future, Platform Bus will be responsible for handling all
   PCI, USB, and hardwired devices on all platforms.
 * The first *Bus Driver* was added to manage PCI devices. It uses a new system call, `pci_get_info`, to get the raw
   information about PCI from the kernel, and then creates a Platform Bus device for each function, with the correct