doc: Periodic grammarcheck of documentation. * doc/interpreter/basics.txi, doc/interpreter/expr.txi, doc/interpreter/install.txi, doc/interpreter/java.txi, doc/interpreter/plot.txi, doc/interpreter/sparse.txi, doc/interpreter/vectorize.txi, libinterp/corefcn/cellfun.cc, libinterp/corefcn/debug.cc, libinterp/corefcn/file-io.cc, libinterp/corefcn/load-save.cc, libinterp/corefcn/matrix_type.cc, libinterp/corefcn/pr-output.cc, libinterp/parse-tree/oct-parse.in.yy, liboctave/numeric/LSODE-opts.in, scripts/image/imformats.m, scripts/image/imread.m, scripts/image/imwrite.m, scripts/miscellaneous/error_ids.m, scripts/miscellaneous/fileattrib.m, scripts/miscellaneous/mex.m, scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/warning_ids.m, scripts/prefs/prefdir.m, scripts/prefs/preferences.m, scripts/signal/fftfilt.m, scripts/strings/isstrprop.m, scripts/testfun/assert.m: Periodic grammarcheck of documentation.

--- a/scripts/prefs/prefdir.m
+++ b/scripts/prefs/prefdir.m
@@ -17,18 +17,20 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} prefdir 
-## @deftypefnx {Function File} {@var{dir} =} prefdir 
+## @deftypefn  {Command} {} prefdir 
+## @deftypefnx {Command} {@var{dir} =} prefdir 
 ## Return the directory that contains the preferences for Octave.
 ##
 ## Examples:
 ##
 ## Display the preferences directory
+##
 ## @example
 ## prefdir
 ## @end example
 ##
 ## Change to the preferences folder
+##
 ## @example
 ## cd (prefdir)
 ## @end example