Fix confusing interaction between @code macro and transpose operator (') in documentation (Bug #34661). * octave.texi: Define new @xcode macro which expands to nothing in plain text or Info output. Expands to normal @code for all other formats. * data.cc: Rephrase documentation for functions which have operator equivalents. Use @xcode macro to mark the operator equivalent for these functions. * expr.txi: Use @asis markup in table to prevent confusion between transpose operator and @code expansion in Info format. * mk_doc_cache.m, __makeinfo__.m: Add processing for new @xcode macro. * krylov.m, etreeplot.m, lu.cc, schur.cc, symbfact.cc: Use new @xcode macro.

--- a/scripts/sparse/etreeplot.m
+++ b/scripts/sparse/etreeplot.m
@@ -20,7 +20,7 @@
 ## @deftypefn  {Function File} {} etreeplot (@var{A})
 ## @deftypefnx {Function File} {} etreeplot (@var{A}, @var{node_style}, @var{edge_style})
 ## Plot the elimination tree of the matrix @var{A} or
-## @code{@var{A}+@var{A}'} if @var{A} in not symmetric.  The optional
+## @xcode{@var{A}+@var{A}'} if @var{A} in not symmetric.  The optional
 ## parameters @var{node_style} and @var{edge_style} define the output
 ## style.
 ## @seealso{treeplot, gplot}