Fix inline code snippet typos
There are a couple of typos where a backtick is missing / too much which results in slightly broken formatting. This PR should hopefully fix them.
//! ```
#![doc = include_str!("../../examples/tutorial_derive/03_03_positional.md")]
//!
-//! Note that the default [`ArgAction`][crate::ArgAction]` is [`Set`][crate::ArgAction::Set]. To
+//! Note that the default [`ArgAction`][crate::ArgAction] is [`Set`][crate::ArgAction::Set]. To
//! accept multiple values, use [`Append`][crate::ArgAction::Append]:
//! ```rust
#![doc = include_str!("../../examples/tutorial_derive/03_03_positional_mult.rs")]
//! ```
#![doc = include_str!("../../examples/tutorial_derive/03_02_option.md")]
//!
-//! Note that the default [`ArgAction`][crate::ArgAction]` is [`Set`][crate::ArgAction::Set]. To
+//! Note that the default [`ArgAction`][crate::ArgAction] is [`Set`][crate::ArgAction::Set]. To
//! accept multiple occurrences, use [`Append`][crate::ArgAction::Append]:
//! ```rust
#![doc = include_str!("../../examples/tutorial_derive/03_02_option_mult.rs")]
//! ```
#![doc = include_str!("../../examples/tutorial_derive/03_01_flag_bool.md")]
//!
-//! Note that the default [`ArgAction`][crate::ArgAction]` for a `bool` field is
+//! Note that the default [`ArgAction`][crate::ArgAction] for a `bool` field is
//! [`SetTrue`][crate::ArgAction::SetTrue]. To accept multiple values, use
//! [`Append`][crate::ArgAction::Append]:
//!
//! ## Validation
//!
//! An appropriate default parser/validator will be selected for the field's type. See
-//! [`value_parser!][crate::value_parser!] for more details.
+//! [`value_parser!`][crate::value_parser!] for more details.
//!
//! ### Enumerated values
//!
