Fix a couple of typos in the integration_testing.md file

Author: alexfertel

src/testing/integration_testing.md

@@ -47,8 +47,8 @@ running 0 tests
 test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
 ```
 
-Each Rust source file in `tests` directory is compiled as a separate crate. One
-way of sharing some code between integration tests is making module with public
+Each Rust source file in the `tests` directory is compiled as a separate crate. One
+way of sharing some code between integration tests is making a module with public
 functions, importing and using it within tests.
 
 File `tests/common.rs`: