doc: Use XREF as anchor prefix in documentation for clearer results in Info viewer. Correctly use @xref, @pxref, @ref macros in documentation. * doc/interpreter/arith.txi, doc/interpreter/basics.txi, doc/interpreter/container.txi, doc/interpreter/debug.txi, doc/interpreter/diagperm.txi, doc/interpreter/eval.txi, doc/interpreter/external.txi, doc/interpreter/func.txi, doc/interpreter/install.txi, doc/interpreter/interp.txi, doc/interpreter/intro.txi, doc/interpreter/java.txi, doc/interpreter/matrix.txi, doc/interpreter/munge-texi.pl, doc/interpreter/numbers.txi, doc/interpreter/package.txi, doc/interpreter/plot.txi, doc/interpreter/sparse.txi, doc/interpreter/stats.txi, doc/interpreter/strings.txi, doc/interpreter/system.txi, doc/interpreter/var.txi, doc/interpreter/vectorize.txi, libinterp/corefcn/error.cc, libinterp/corefcn/qz.cc, libinterp/corefcn/regexp.cc, scripts/general/accumarray.m, scripts/general/structfun.m, scripts/miscellaneous/edit.m, scripts/miscellaneous/setfield.m, scripts/miscellaneous/warning_ids.m, scripts/optimization/fminbnd.m, scripts/optimization/fzero.m, scripts/optimization/lsqnonneg.m: Use XREF as anchor prefix in documentation for clearer results in Info viewer. Correctly use @xref, @pxref, @ref macros in documentation. * scripts/plot/line.m: Remove extra ')' in @deftypefn. * libgui/src/qtinfo/parser.cc(find_ref): Change doc anchor search pattern to XREF.

--- a/doc/interpreter/sparse.txi
+++ b/doc/interpreter/sparse.txi
@@ -307,9 +307,8 @@
 
 The above problem of memory reallocation can be avoided in
 oct-files.  However, the construction of a sparse matrix from an oct-file
-is more complex than can be discussed here, and
-you are referred to chapter @ref{External Code Interface}, to have
-a full description of the techniques involved.
+is more complex than can be discussed here.  @xref{External Code Interface},
+for a a full description of the techniques involved.
 
 @node Information
 @subsection Finding out Information about Sparse Matrices
@@ -342,7 +341,7 @@
 
 When solving linear equations involving sparse matrices Octave
 determines the means to solve the equation based on the type of the
-matrix as discussed in @ref{Sparse Linear Algebra}.  Octave probes the
+matrix (@pxref{Sparse Linear Algebra}).  Octave probes the
 matrix type when the div (/) or ldiv (\) operator is first used with
 the matrix and then caches the type.  However the @dfn{matrix_type}
 function can be used to determine the type of the sparse matrix prior