docs(dateFilter): fix typos

Fix closing parenthesis, quotes around string literal and remove
trailing whitespace.

Closes #3250

Author: brunocoelho

src/ng/filter/filters.js

@@ -294,15 +294,15 @@ var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZE']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|d+
  *   * `'short'`: equivalent to `'M/d/yy h:mm a'` for en_US  locale (e.g. 9/3/10 12:05 pm)
  *   * `'fullDate'`: equivalent to `'EEEE, MMMM d,y'` for en_US  locale
  *     (e.g. Friday, September 3, 2010)
- *   * `'longDate'`: equivalent to `'MMMM d, y'` for en_US  locale (e.g. September 3, 2010
+ *   * `'longDate'`: equivalent to `'MMMM d, y'` for en_US  locale (e.g. September 3, 2010)
  *   * `'mediumDate'`: equivalent to `'MMM d, y'` for en_US  locale (e.g. Sep 3, 2010)
  *   * `'shortDate'`: equivalent to `'M/d/yy'` for en_US locale (e.g. 9/3/10)
  *   * `'mediumTime'`: equivalent to `'h:mm:ss a'` for en_US locale (e.g. 12:05:08 pm)
  *   * `'shortTime'`: equivalent to `'h:mm a'` for en_US locale (e.g. 12:05 pm)
  *
  *   `format` string can contain literal values. These need to be quoted with single quotes (e.g.
  *   `"h 'in the morning'"`). In order to output single quote, use two single quotes in a sequence
- *   (e.g. `"h o''clock"`).
+ *   (e.g. `"h 'o''clock'"`).
  *
  * @param {(Date|number|string)} date Date to format either as Date object, milliseconds (string or
  *    number) or various ISO 8601 datetime string formats (e.g. yyyy-MM-ddTHH:mm:ss.SSSZ and its