linkedlist: correct grammar in comments

PR-URL: #14546
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

Author: alexbostock

lib/internal/linkedlist.js

@@ -14,7 +14,7 @@ function create() {
 }
 exports.create=create;
 
-// show the most idle item
+// Show the most idle item.
 functionpeek(list){
 if(list._idlePrev===list)returnnull;
 returnlist._idlePrev;
@@ -31,7 +31,7 @@ function shift(list) {
 exports.shift=shift;
 
 
-// remove a item from its list
+// Remove an item from its list.
 functionremove(item){
 if(item._idleNext){
 item._idleNext._idlePrev=item._idlePrev;
@@ -47,18 +47,18 @@ function remove(item) {
 exports.remove=remove;
 
 
-// remove a item from its list and place at the end.
+// Remove an item from its list and place at the end.
 functionappend(list,item){
 if(item._idleNext||item._idlePrev){
 remove(item);
 }
 
-// items are linked with _idleNext -> (older) and _idlePrev -> (newer)
+// Items are linked with _idleNext -> (older) and _idlePrev -> (newer).
 // Note: This linkage (next being older) may seem counter-intuitive at first.
 item._idleNext=list._idleNext;
 item._idlePrev=list;
 
-// the list _idleNext points to tail (newest) and _idlePrev to head (oldest)
+// The list _idleNext points to tail (newest) and _idlePrev to head (oldest).
 list._idleNext._idlePrev=item;
 list._idleNext=item;
 }