Update logging.mdx (huggingface#2863)

Fix typos

Author: tolgacangoz

docs/source/en/api/logging.mdx

@@ -61,7 +61,7 @@ verbose to the most verbose), those levels (with their corresponding int values
   critical errors.
 - `diffusers.logging.ERROR` (int value, 40): only report errors.
 - `diffusers.logging.WARNING` or `diffusers.logging.WARN` (int value, 30): only reports error and
-  warnings. This the default level used by the library.
+  warnings. This is the default level used by the library.
 - `diffusers.logging.INFO` (int value, 20): reports error, warnings and basic information.
 - `diffusers.logging.DEBUG` (int value, 10): report all information.