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/libinterp/corefcn/cellfun.cc	Sun Aug 04 11:57:26 2013 -0700
+++ b/libinterp/corefcn/cellfun.cc	Sun Aug 04 13:08:39 2013 -0700
@@ -297,7 +297,7 @@
 @item ndims\n\
 Return the number of dimensions of each element.\n\
 \n\
-@item numel\n\
+@item  numel\n\
 @itemx prodofsize\n\
 Return the number of elements contained within each cell element.  The\n\
 number is the product of the dimensions of the object at each cell element.\n\