Bug 19971: Typo in the comments of parseQuery routine

Bug 19971: Typo in the comments of parseQuery routine

TEST PLAN
---------
1) Run these commands:
    git checkout master
    git pull
    perldoc C4::Search
2) look for parseQuery
    -- NOTE: The sample code provided below this heading has
             the wrong function name!
3) Run these commands:
    git checkout -b bug_19971 origin/master
    perldoc C4::Search
4) look for parseQuery
    -- NOTE: The wrong function name is corrected.
5) Run koha qa test tools

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>