Fix some doc issues

heed-types/src/lib.rs

@@ -4,7 +4,7 @@
 //! For specific types you can choose:
 //!   - [`Str`] to store [`str`](primitive@str)s
 //!   - [`Unit`] to store `()` types
-//!   - [`SerdeBincode`] or [`SerdeJson`] to store [`Serialize`]/[`Deserialize`] types
+//!   - [`SerdeBincode`] or [`SerdeJson`] to store [`serde::Serialize`]/[`serde::Deserialize`] types
 //!
 //! But if you want to store big types that can be efficiently deserialized then
 //! here is a little table to help you in your quest:

heed-types/src/str.rs

@@ -4,7 +4,7 @@ use std::{str, marker};
 use heed_traits::{BytesDecode, BytesEncode};
 use bytemuck::try_cast_slice;
 
-/// Describes an [`str`].
+/// Describes an [`prim@str`].
 pub struct Str<'a> {
     _phantom: marker::PhantomData<&'a ()>,
 }

heed/src/env.rs

@@ -100,6 +100,7 @@ impl EnvOpenOptions {
     }
 
     /// Set one or [more LMDB flags](http://www.lmdb.tech/doc/group__mdb__env.html).
+    ///
     /// ```
     /// use std::fs;
     /// use std::path::Path;