Update toolshed/check_cython_abi.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mdboom

toolshed/check_cython_abi.py

@@ -16,7 +16,7 @@
 
      python check_cython_abi.py generate <package_name> <dir>
 
-3) Checkout a version with the changes to by tested, and build and install.
+3) Checkout a version with the changes to be tested, and build and install.
 
 4) Check the ABI against the previously generated files by running: