[jdom-interest] Minor grammar errors in XMLOutputter Javadoc

[Elliotte Rusty Harold]

Change "it's contents" to "its contents" on line 183

Change "it's <code>{@link Attribute}</code>s" to "it's <code>{@link 
Attribute}</code>s" on line 556 and line 777 and 1256

Note: you can't just do a search and replace for "it's" because that 
contraction is also used correctly elsewhere in the file.

-- 
+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo at metalab.unc.edu | Writer/Programmer |
+-----------------------+------------------------+-------------------+ 
|           The XML Bible, 2nd Edition (IDG Books, 2001)             |
|             http://www.cafeconleche.org/books/bible2/              |
|   http://www.amazon.com/exec/obidos/ISBN=0764547607/cafeaulaitA/   |
+----------------------------------+---------------------------------+
|  Read Cafe au Lait for Java News:   http://www.cafeaulait.org/     | 
|  Read Cafe con Leche for XML News:  http://www.cafeconleche.org/   |
+----------------------------------+---------------------------------+