message: Update docs to make localised date formats clearer
  "PP" and "PPpp" use abbreviated months, whereas "PPP" and "PPPppp" use full month names. The existing example (29th May 1453) is in May, which is the only month (in English) where the abbreviated and full month names are the same.
diff: @@ -193,18 +193,18 @@ var unescapedLatinCharacterRegExp = /[a-zA-Z]/
  * | | tt | ... | 3,7 |
  * | Milliseconds timestamp | T | 512969520900 | 7 |
  * | | TT | ... | 3,7 |
  - * | Long localized date | P | 05/29/1453 | 7 |
  - * | | PP | May 29, 1453 | 7 |
  - * | | PPP | May 29th, 1453 | 7 |
  - * | | PPPP | Sunday, May 29th, 1453 | 2,7 |
  + * | Long localized date | P | 04/29/1453 | 7 |
  + * | | PP | Apr 29, 1453 | 7 |
  + * | | PPP | April 29th, 1453 | 7 |
  + * | | PPPP | Friday, April 29th, 1453 | 2,7 |
  * | Long localized time | p | 12:00 AM | 7 |
  * | | pp | 12:00:00 AM | 7 |
  * | | ppp | 12:00:00 AM GMT+2 | 7 |
  * | | pppp | 12:00:00 AM GMT+02:00 | 2,7 |
  - * | Combination of date and time | Pp | 05/29/1453, 12:00 AM | 7 |
  - * | | PPpp | May 29, 1453, 12:00:00 AM | 7 |
  - * | | PPPppp | May 29th, 1453 at ... | 7 |
  - * | | PPPPpppp| Sunday, May 29th, 1453 at ... | 2,7 |
  + * | Combination of date and time | Pp | 04/29/1453, 12:00 AM | 7 |
  + * | | PPpp | Apr 29, 1453, 12:00:00 AM | 7 |
  + * | | PPPppp | April 29th, 1453 at ... | 7 |
  + * | | PPPPpppp| Friday, April 29th, 1453 at ... | 2,7 |
  * Notes:
  * 1. "Formatting" units (e.g. formatting quarter) in the default en-US locale
  * are the same as "stand-alone" units, but are different in some languages.
  