meta: remove use of profanity in source

The CoC requests to avoid the casual use of profanity.

PR-URL: https://github.com/nodejs/node/pull/4122
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: targos - Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

benchmark/http_simple_bench.sh

@@ -42,7 +42,7 @@ ab_hello_world() {
   data_fn="$dir/$date.data"
 
   echo "Bench $name starts in 3 seconds..."
-  # let shit calm down
+  # let things calm down
   sleep 3
 
   # hammer that as hard as it can for 10 seconds.

lib/dns.js

@@ -14,7 +14,7 @@ const isIp = net.isIP;
 
 
 function errnoException(err, syscall, hostname) {
-  // FIXME(bnoordhuis) Remove this backwards compatibility shite and pass
+  // FIXME(bnoordhuis) Remove this backwards compatibility nonsense and pass
   // the true error to the user. ENOTFOUND is not even a proper POSIX error!
   if (err === uv.UV_EAI_MEMORY ||
       err === uv.UV_EAI_NODATA ||