fix guide

Author: aviramha

src/ffi/mod.rs

@@ -205,6 +205,6 @@ mod cpython;
 #[cfg(not(Py_LIMITED_API))]
 pub use self::cpython::*;
 
-/// Helper to enable #[pymethods] to see the workaround for __ipow__ on Python 3.7
+/// Helper to enable #\[pymethods\] to see the workaround for __ipow__ on Python 3.7
 #[doc(hidden)]
 pub use crate::impl_::pymethods::ipowfunc;