tidy: enforce comment blocks to have even number of backticks

Some comments may be formed like:

// This function takes a tuple `(Vec<String>,
// Box<[u8]>)` and transforms it into `Vec<u8>`.

where the "back-ticked" section wraps around.
Therefore, we can't make a single-line based
lint.

We also cannot make the lint paragraph based,
as it would otherwise complain about inline
code blocks:

/// ```
/// use super::Foo;
///
/// fn main() { Foo::new(); }
/// ```

For the future, one could introduce some checks
to treat code blocks specially, but such code
would make the check even more complicated.

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