[tracker] Fix XPS configure help string

[Michael Biebl <mbiebl src gnome org>]

commit ffcb0790960f95c7f6fa364d674f5eadb3d46d3e
Author: Michael Biebl <biebl debian org>
Date:   Sun Nov 4 16:04:27 2012 +0100

    Fix XPS configure help string

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3ab0183..93e14ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1858,7 +1858,7 @@ AM_CONDITIONAL(HAVE_POPPLER, test "x$have_poppler" = "xyes")
 
 AC_ARG_ENABLE(libgxps,
               AS_HELP_STRING([--enable-libgxps],
-                             [enable extractor for PDF data [[default=auto]]]),,
+                             [enable extractor for XPS data [[default=auto]]]),,
               [enable_libgxps=auto])
 
 if test "x$enable_libgxps" != "xno" ; then
@@ -2511,4 +2511,4 @@ WARNING:
         Unsafe versions are 3.7.10 to 3.7.13.
 
 "
-fi
\ No newline at end of file
+fi