Fix a pair of typos

Author: lnicola

crates/stdx/src/rand.rs

@@ -1,8 +1,8 @@
 //! We don't use `rand`, as that's too many things for us.
 //!
-//! Currently, we use oorandom instead, but it misses these two utilities.
-//! Perhaps we should switch to `fastrand`, or our own small prng, it's not like
-//! we need anything move complicatied that xor-shift.
+//! We currently use oorandom instead, but it's missing these two utilities.
+//! Perhaps we should switch to `fastrand`, or our own small PRNG, it's not like
+//! we need anything more complicated that xor-shift.
 
 pub fn shuffle<T>(slice: &mut [T], mut rand_index: impl FnMut(usize) -> usize) {
     let mut remaining = slice.len() - 1;