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/miscellaneous/fileattrib.m	Sun Aug 04 11:57:26 2013 -0700
+++ b/scripts/miscellaneous/fileattrib.m	Sun Aug 04 13:08:39 2013 -0700
@@ -39,19 +39,19 @@
 ## @item directory
 ## True if @var{file} is a directory.
 ##
-## @item UserRead
+## @item  UserRead
 ## @itemx GroupRead
 ## @itemx OtherRead
 ## True if the user (group; other users) has read permission for
 ## @var{file}.
 ##
-## @item UserWrite
+## @item  UserWrite
 ## @itemx GroupWrite
 ## @itemx OtherWrite
 ## True if the user (group; other users) has write permission for
 ## @var{file}.
 ##
-## @item UserExecute
+## @item  UserExecute
 ## @itemx GroupExecute
 ## @itemx OtherExecute
 ## True if the user (group; other users) has execute permission for