Update errata.md with suggestions from readers

Update errata.md with suggestions from readers

errata.md

@@ -1,13 +1,140 @@
 # Errata for *Book Title*
 
-On **page xx** [Summary of error]:
+On **page 130** [Summary of error]:
 
-Details of error here. Highlight key pieces in **bold**.
+Bubble sort had minor **index** issue.
+
+Before:
+```
+function bubbleSort(array) {
+    for (var i = 0, arrayLength = array.length; i < arrayLength; i++) {
+        for (var j = 0; j <= i; j++) {
+            if (array[i] < array[j]) {
+                var temp = array[i];
+                array[i] = array[j];
+                array[j] = temp;
+            }
+        }
+    }
+    return array;
+}
+```
+
+After:
+```
+function bubbleSort(array) {
+    for (var i = 0, arrayLength = array.length; i < arrayLength; i++) {
+        for (var j = 0; j < arrayLength - 1 - i; j++) {
+            if (array[j] > array[j+1]) {
+                var temp = array[j];
+                array[j] = array[j+1];
+                array[j+1] = temp;
+            }
+        }
+    }
+    return array;
+}
+```
 
 ***
 
-On **page xx** [Summary of error]:
+On **page 70** [Summary of error]:
 
 Details of error here. Highlight key pieces in **bold**.
 
-***
+Before:
+```
+var matrix3by3 = [[1,2,3],[4,5,6],[7,8,9]];
+matrix3by3[0]; // [1,2,3] 
+matrix3by3[1]; // [4,5,6]
+matrix3by3[2]; // [7,8,9]
+```
+
+After:
+```
+var matrix3by3 = [[1,2,3],[4,5,6],[7,8,9]];
+matrix3by3[0]; // [1,2,3] 
+matrix3by3[1]; // [4,5,6]
+matrix3by3[2]; // [7,8,9]
+```
+
+***
+
+On **page 65** [Summary of error]:
+
+Before:
+```
+var evenOffset = pos % 2 == 0 ? 1 : 0,
+    offsetMinus = Math.floor(pos / 2) - evenOffset,
+    offsetPlus = Math.floor(pos / 2) + evenOffset;
+
+
+if (median1 < median2) {
+    return medianOfTwoSortedArray(arr1.slice(offsetMinus), arr2.slice(offsetMinus), offsetPlus);
+} else {
+    return medianOfTwoSortedArray(arr2.slice(offsetMinus), arr1.slice(offsetMinus), offsetPlus);
+}
+```
+
+
+After:
+```
+var evenOffset = pos % 2 == 0 ? 1 : 0,
+    offsetMinus = Math.floor(pos / 2) - evenOffset,
+    offsetPlus = pos - Math.floor(pos / 2) + evenOffset;
+
+
+if (median1 < median2) {
+    return medianOfTwoSortedArray(arr1.slice(offsetMinus), arr2.slice(0, -offsetMinus), offsetPlus);
+} else {
+    return medianOfTwoSortedArray(arr2.slice(offsetMinus), arr1.slice(0, -offsetMinus), offsetPlus);
+}
+```
+
+
+***
+
+On **page 183** [Summary of error]:
+
+Before:
+```
+DoublyLinkedList.prototype.deleteAtHead = function() {
+    var toReturn = null;
+
+    if (this.head !== null) {
+        toReturn = this.head.data;
+
+        if (this.tail === this.head) {
+            this.head = null;
+            this.tail = null;
+        } else {
+            this.head = this.head.next;
+            this.head.prev = null;
+        }
+    }
+    this.size--;
+    return toReturn;
+}
+```
+
+After:
+```
+SinglyLinkedList.prototype.deleteAtHead = function() {
+    var toReturn = null;
+
+    if (this.head !== null) {
+      toReturn = this.head.data;
+      this.head = this.head.next;
+      this.size--;
+    }
+    return toReturn;
+}
+```
+
+
+***
+
+
+On **AVL Trees** [Summary of error]:
+
+`getDepthFromChildren()` and `updateInNewLocation()` needs to be renamed to: `setDepthBasedOnChildren()`