[gobject-introspection] configure: correct --enable-doctool documentation

[Dieter Verfaillie <dieterv src gnome org>]

commit 105852ea80cc9c8fa6436ca9eefb1ab6aadd3512
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Mon Mar 2 20:24:21 2015 +0100

    configure: correct --enable-doctool documentation
    
    The executable is named 'g-ir-doc-tool', not 'g-ir-doctool'.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=670985

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9965ae2..12ce4d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -266,7 +266,7 @@ fi
 
 dnl Not enabled by default until 3.6 cycle when we can propose mako as
 dnl an external dependency
-AC_ARG_ENABLE(doctool,[  --disable-doctool           disable g-ir-doctool ],,enable_doctool=auto)
+AC_ARG_ENABLE(doctool,[  --disable-doctool           disable g-ir-doc-tool ],,enable_doctool=auto)
 AS_IF([ test x$enable_doctool != xno], [
    AM_CHECK_PYMOD(mako,,have_python_mako=yes,have_python_mako=no)
 ])
@@ -286,7 +286,7 @@ AC_MSG_CHECKING([for glib source directory to use for documentation])
 AC_ARG_WITH(glib-src,
        [  --with-glib-src=PATH    Source directory for glib - needed to add docs to gir],
        GLIBSRC=$withval
-) 
+)
 AM_CONDITIONAL(WITH_GLIBSRC, test x"$GLIBSRC" != x)
 AC_SUBST(GLIBSRC)
 AC_MSG_RESULT([$GLIBSRC])