Update rustc-driver.md

Author: Tbkhi

src/rustc-driver.md

@@ -29,7 +29,7 @@ drives the compilation to completion.
 
 Finally [`rustc_driver::run_compiler()`][rd_rc] also takes a [`Callbacks`][cb],
 which is a `trait` that allows for custom compiler configuration, as well as
-allowing some custom code run after different phases of the compilation.
+allowing custom code to run after different phases of the compilation.
 
 > **Warning:** By its very nature, the internal compiler APIs are always going
 > to be unstable. That said, we do try not to break things unnecessarily.
@@ -47,4 +47,4 @@ allowing some custom code run after different phases of the compilation.
 [i_rc]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/interface/fn.run_compiler.html
 [rd_rc]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_driver_impl/fn.run_compiler.html
 [stupid-stats]: https://github.com/nrc/stupid-stats
-[`nightly-rustc`]: https://doc.rust-lang.org/nightly/nightly-rustc/
+[`nightly-rustc`]: https://doc.rust-lang.org/nightly/nightly-rustc/