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/debug.cc
+++ b/libinterp/corefcn/debug.cc
@@ -1041,7 +1041,7 @@
 @deftypefn  {Command} {} dblist\n\
 @deftypefnx {Command} {} dblist @var{n}\n\
 In debugging mode, list @var{n} lines of the function being debugged\n\
-centered around the the current line to be executed.  If unspecified @var{n}\n\
+centered around the current line to be executed.  If unspecified @var{n}\n\
 defaults to 10 (+/- 5 lines)\n\
 @seealso{dbwhere, dbtype}\n\
 @end deftypefn")