Fix typo and one instance of missing backticks. (#62)

Author: waywardmonkeys

src/scalar/subset.rs

@@ -5,7 +5,7 @@ use num_complex::Complex;
 
 /// Nested sets and conversions between them (using an injective mapping). Useful to work with
 /// substructures. In generic code, it is preferable to use `SupersetOf` as trait bound whenever
-/// possible instead of `SubsetOf` (because SupersetOf is automatically implemented whenever
+/// possible instead of `SubsetOf` (because `SupersetOf` is automatically implemented whenever
 /// `SubsetOf` is).
 ///
 /// The notion of "nested sets" is very broad and applies to what the types are _supposed to

src/simd/rand_impl.rs

@@ -1,7 +1,7 @@
 use crate::simd::*;
 
 // Given two token streams in the format `ignore_snd!([first_token_tree], [second])` will simply
-// expand to the first one. This is usefull in order to allow the repetition of some statement
+// expand to the first one. This is useful in order to allow the repetition of some statement
 // according to some repetition variable, without using the repetition variables.
 macro_rules! ignore_snd (
     ([$($fst: tt)*], [$($snd: tt)*]) => ($($fst)*)