(tiny) documentation typo fix

supressing -> suppressing

There are three more instances of this typo in the changelogs, but I assume you don't want to change them after the fact.

    $ grep -Rin 'supress' *
    CHANGELOG:50:- Fixed #36: @SupressWarnings annotation does not work for 
    src/site/docx/changes.xml:213:                @SupressWarnings annotation does not work for
    src/conf/package.xml:537:- Fixed #36: @SupressWarnings annotation does not work for