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/doc/interpreter/vectorize.txi	Sun Aug 04 11:57:26 2013 -0700
+++ b/doc/interpreter/vectorize.txi	Sun Aug 04 13:08:39 2013 -0700
@@ -606,7 +606,7 @@
 @group
 a = zeros (1000); # create a 1000x1000 matrix
 b = a(:,10:100);  # lazy slice
-a = []; # the original a array is still allocated
+a = []; # the original "a" array is still allocated
 c@{1@} = b; # b is reallocated at this point
 @end group
 @end example