docs(dateFilter): fix docs to match implementation for week no formatting

src/ng/filter/filters.js

@@ -356,8 +356,8 @@ var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZEw']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|d
  *   * `'.sss' or ',sss'`: Millisecond in second, padded (000-999)
  *   * `'a'`: AM/PM marker
  *   * `'Z'`: 4 digit (+sign) representation of the timezone offset (-1200-+1200)
- *   * `'ww'`: ISO-8601 week of year (00-53)
- *   * `'w'`: ISO-8601 week of year (0-53)
+ *   * `'ww'`: Week of year, padded (00-53). Week 01 is the week with the first Thursday of the year
+ *   * `'w'`: Week of year (0-53). Week 1 is the week with the first Thursday of the year
  *
  *   `format` string can also be one of the following predefined
  *   {@link guide/i18n localizable formats}:

test/ng/filter/filtersSpec.js

@@ -326,6 +326,36 @@ describe('filters', function() {
                     toEqual('2010-09-03T06:35:08-0530');
     });
 
+    it('should correctly calculate week number', function() {
+      function formatWeek(dateToFormat) {
+        return date(new angular.mock.TzDate(+5, dateToFormat + 'T12:00:00.000Z'), 'ww (EEE)');
+      }
+
+      expect(formatWeek('2007-01-01')).toEqual('01 (Mon)');
+      expect(formatWeek('2007-12-31')).toEqual('53 (Mon)');
+
+      expect(formatWeek('2008-01-01')).toEqual('01 (Tue)');
+      expect(formatWeek('2008-12-31')).toEqual('53 (Wed)');
+
+      expect(formatWeek('2014-01-01')).toEqual('01 (Wed)');
+      expect(formatWeek('2014-12-31')).toEqual('53 (Wed)');
+
+      expect(formatWeek('2009-01-01')).toEqual('01 (Thu)');
+      expect(formatWeek('2009-12-31')).toEqual('53 (Thu)');
+
+      expect(formatWeek('2010-01-01')).toEqual('00 (Fri)');
+      expect(formatWeek('2010-12-31')).toEqual('52 (Fri)');
+
+      expect(formatWeek('2011-01-01')).toEqual('00 (Sat)');
+      expect(formatWeek('2011-01-02')).toEqual('01 (Sun)');
+      expect(formatWeek('2011-01-03')).toEqual('01 (Mon)');
+      expect(formatWeek('2011-12-31')).toEqual('52 (Sat)');
+
+      expect(formatWeek('2012-01-01')).toEqual('01 (Sun)');
+      expect(formatWeek('2012-01-02')).toEqual('01 (Mon)');
+      expect(formatWeek('2012-12-31')).toEqual('53 (Mon)');
+    });
+
     it('should treat single quoted strings as string literals', function() {
       expect(date(midnight, "yyyy'de' 'a'x'dd' 'adZ' h=H:m:saZ")).
                       toEqual('2010de axdd adZ 12=0:5:8AM-0500');