[mlir][docs] Fix typo in PassManagement.md (NFC) (#140891)

Author: csstormq

mlir/docs/PassManagement.md

@@ -878,7 +878,7 @@ struct MyPassOptions {
 #endif // GEN_PASS_DECL_MYPASS
 ```
 
-The utogenerated file will also contain the declarations of the default
+The autogenerated file will also contain the declarations of the default
 constructors.
 
 ```c++