update Brazilian Portuguese translation:

 * manual/index.xml.pt-br, manual/new_features_2_2.xml.pt-br,
   manual/style/lang/pt-br.xml: Minor changes

 * upgrading.xml.pt-br: New translation

Submitted by: Eduardo Tompson Pereira <duaspila ig.com.br>
Reviewed by: Luiz Rocha <lsdrocha gmail.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@148972 13f79535-47bb-0310-9956-ffa450edef68