Fix some typos (#1865)

Author: Snowiiii

CHANGELOG.md

@@ -25,7 +25,7 @@
 * Fixed an issue where accepting on a UDS socket without sometime pass an address
   with a NULL byte to SocketAddr::from_pathname
   (https://github.com/tokio-rs/mio/pull/1817).
-* Internal cleanups that should make the `cfg` sitations easier to follow
+* Internal cleanups that should make the `cfg` situations easier to follow
   (https://github.com/tokio-rs/mio/pull/1812,
   https://github.com/tokio-rs/mio/pull/1813).
 
@@ -550,7 +550,7 @@ information.
 - Work around Linux kernel < 2.6.37 bug on 32-bits making timeouts longer then
   ~30 minutes effectively infinite
   (https://github.com/tokio-rs/mio/commit/e7cba59950e9c9fa6194e29b5b1e72029e3df455).
-- Update miow and net2 depedencies to get rid of invalid memory layout assumption
+- Update miow and net2 dependencies to get rid of invalid memory layout assumption
   (https://github.com/tokio-rs/mio/commit/13f02ac0a86d7c0c0001e5ff8960a0b4340d075c).
 
 # 0.6.22 (May 01, 2020)

src/sys/unix/net.rs

@@ -31,7 +31,7 @@ pub(crate) fn new_socket(domain: libc::c_int, socket_type: libc::c_int) -> io::R
 
     let socket = syscall!(socket(domain, socket_type, 0))?;
 
-    // Mimick `libstd` and set `SO_NOSIGPIPE` on apple systems.
+    // Mimic `libstd` and set `SO_NOSIGPIPE` on apple systems.
     #[cfg(any(
         target_os = "ios",
         target_os = "macos",